quicksettings: fix landscape not being scrollable

Currently, Quick Settings in landscape mode is not scrollable, due to issues with `scrollViewComponent`. This causes some buttons to become unseen in landscape mode but not portrait. This has been solved by deleting `scrollViewComponent` and replacing it with `swipeViewComponent`, to allow swiping to access other buttons in Quick Settings.

Before (docked mode and hotspot are missing):

![screen-recording__1_](/uploads/e0c4eaf22a2ec401c66e9e513e8ce7e1/screen-recording__1_.webm)

After (docked mode and hotspot are there):

![screen-recording](/uploads/404ebbecc87e1b60b2501b81b8ab83ee/screen-recording.webm)

However, with this setup, `resetSwipeView()` doesn't work, and Quick Settings remains at the page it was left at.

components/mobileshell/qml/actiondrawer/quicksettings/QuickSettings.qml

@@ -103,7 +103,7 @@ Item {
             Layout.minimumHeight: rowCount * rowHeight
 
             asynchronous: true
-            sourceComponent: root.mode === QuickSettings.Pages ? swipeViewComponent : scrollViewComponent
+            sourceComponent: swipeViewComponent
         }
 
         BrightnessItem {
@@ -157,7 +157,7 @@ Item {
         }
     }
 
-    // Loads portrait quick settings view
+    // Loads portrait and landscape quick settings view
     Component {
         id: swipeViewComponent
 
@@ -228,64 +228,6 @@ Item {
         }
     }
 
-    // Loads landscape quick settings view
-    Component {
-        id: scrollViewComponent
-
-        Item {
-            width: parent.width
-            height: rowCount * rowHeight
-
-            Flickable {
-                id: flickable
-                anchors.fill: parent
-                contentWidth: width
-                contentHeight: flow.height
-
-                clip: true
-
-                ScrollIndicator.vertical: ScrollIndicator {
-                    id: scrollIndicator
-                    visible: quickSettingsCount > pageSize ? true : false
-                    position: 0.1
-
-                    contentItem: Item {
-                        implicitWidth: Kirigami.Units.smallSpacing / 4
-                        Rectangle {
-                            // shift over the indicator a bit to the right
-                            anchors.fill: parent
-                            anchors.leftMargin: 2
-                            anchors.rightMargin: -2
-
-                            color: Kirigami.Theme.textColor
-                            opacity: scrollIndicator.active ? 0.5 : 0
-
-                            Behavior on opacity { NumberAnimation {} }
-                        }
-                    }
-                }
-
-                Flow {
-                    id: flow
-                    width: parent.width
-                    height: Math.ceil(quickSettingsCount / columnCount) * rowHeight
-                    spacing: 0
-
-                    Repeater {
-                        model: quickSettingsModel
-                        delegate: Loader {
-                            required property var modelData
-
-                            asynchronous: true
-
-                            sourceComponent: quickSettingComponent
-                        }
-                    }
-                }
-            }
-        }
-    }
-
     // Quick setting component
     Component {
         id: quickSettingComponent