quicksettings: Use adaptative icons

Personnaly, I don't like much those static icons which doesn't care about the situation in the quicksettings. This MR intends to use when possible and coherent what I call (not native English-speaking I recall) « adaptive » icon.

List of modified quicksettings :
- Wireless
- Bluetooth
- Flashlight
- Audio
- Airplane mode

~~Draft right now because I'm doing it quicksetting-by-quicksetting.~~

EDIT: Feel free to cherry-pick if you don't agree with all icons.

quicksettings/airplanemode/contents/ui/main.qml

@@ -10,7 +10,7 @@ import org.kde.plasma.private.mobileshell.quicksettingsplugin as QS
 
 QS.QuickSetting {
     text: i18n("Airplane Mode")
-    icon: "network-flightmode-on"
+    icon: PlasmaNM.Configuration.airplaneModeEnabled ? "network-flightmode-on" : "network-flightmode-off"
     status: ""
     enabled: PlasmaNM.Configuration.airplaneModeEnabled
 

quicksettings/audio/contents/ui/main.qml

@@ -9,7 +9,7 @@ import org.kde.plasma.private.mobileshell.quicksettingsplugin as QS
 
 QS.QuickSetting {
     text: i18n("Sound")
-    icon: "audio-speakers-symbolic"
+    icon: MobileShell.AudioInfo.icon
     status: i18n("%1%", MobileShell.AudioInfo.volumeValue)
     enabled: false
     settingsCommand: "plasma-open-settings kcm_pulseaudio"

quicksettings/bluetooth/contents/ui/main.qml

@@ -4,6 +4,7 @@
 import QtQuick 2.15
 
 import org.kde.bluezqt 1.0 as BluezQt
+import org.kde.plasma.private.mobileshell as MobileShell
 import org.kde.plasma.private.mobileshell.quicksettingsplugin as QS
 
 QS.QuickSetting {
@@ -13,7 +14,7 @@ QS.QuickSetting {
     id: root
 
     text: i18n("Bluetooth")
-    icon: "network-bluetooth"
+    icon: MobileShell.BluetoothInfo.icon
     settingsCommand: "plasma-open-settings kcm_bluetooth"
     function toggle() {
         const enable = !btManager.bluetoothOperational;

quicksettings/flashlight/package/contents/ui/main.qml

@@ -8,7 +8,7 @@ import org.kde.plasma.private.mobileshell.quicksettingsplugin as QS
 
 QS.QuickSetting {
     text: i18n("Flashlight")
-    icon: "flashlight-on"
+    icon: FlashlightUtil.torchEnabled ? "flashlight-on" : "flashlight-off"
     enabled: FlashlightUtil.torchEnabled
     available: FlashlightUtil.available
     function toggle() {

quicksettings/wifi/contents/ui/main.qml

@@ -21,7 +21,7 @@ QS.QuickSetting {
 
     text: i18n("Wi-Fi")
     status: enabledConnections.wirelessEnabled ? wirelessStatus.wifiSSID : ""
-    icon: "network-wireless-signal"
+    icon: enabledConnections.wirelessEnabled ? "network-wireless" : "network-wireless-disconnected"
     settingsCommand: "plasma-open-settings kcm_mobile_wifi"
     function toggle() {
         nmHandler.enableWireless(!enabledConnections.wirelessEnabled)