Ensure we will always use `Context#getSystemService` extension function provided by `core-ktx`

tools/check/forbidden_strings_in_code.txt

@@ -169,3 +169,6 @@ enum class===76
 ### Do not import temporary legacy classes
 import im.vector.matrix.android.internal.legacy.riot===3
 import org.matrix.androidsdk.crypto.data===2
+
+### Use `Context#getSystemService` extension function provided by `core-ktx`
+getSystemService\(Context

vector/src/main/java/im/vector/app/core/services/CallService.kt

@@ -172,7 +172,7 @@ class CallService : VectorService(), WiredHeadsetStateReceiver.HeadsetEventListe
         // turn the screen on for 3 seconds
 //            if (Matrix.getInstance(VectorApp.getInstance())!!.pushManager.isScreenTurnedOn) {
 //                try {
-//                    val pm = getSystemService(Context.POWER_SERVICE) as PowerManager
+//                    val pm = getSystemService<PowerManager>()!!
 //                    val wl = pm.newWakeLock(
 //                            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON or PowerManager.ACQUIRE_CAUSES_WAKEUP,
 //                            CallService::class.java.simpleName)

vector/src/main/java/im/vector/app/features/notifications/NotificationDrawerManager.kt

@@ -442,7 +442,7 @@ class NotificationDrawerManager @Inject constructor(private val context: Context
                         /*
                         TODO
                         if (Matrix.getInstance(VectorApp.getInstance())!!.pushManager.isScreenTurnedOn) {
-                            val pm = VectorApp.getInstance().getSystemService(Context.POWER_SERVICE) as PowerManager
+                            val pm = VectorApp.getInstance().getSystemService<PowerManager>()!!
                             val wl = pm.newWakeLock(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON or PowerManager.ACQUIRE_CAUSES_WAKEUP,
                                     NotificationDrawerManager::class.java.name)
                             wl.acquire(3000)