fix: Clear notifications on device switch (#2281)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

app/src/main/java/com/geeksville/mesh/service/MeshService.kt

@@ -2040,9 +2040,14 @@ class MeshService : Service(), Logging {
                     putString("device_address", deviceAddr)
                 }
                 clearDatabases()
+                clearNotifications()
             }
         }
     }
+
+    private fun clearNotifications() {
+        serviceNotifications.clearNotifications()
+    }
     private val binder = object : IMeshService.Stub() {
 
         override fun setDeviceAddress(deviceAddr: String?) = toRemoteExceptions {

app/src/main/java/com/geeksville/mesh/service/MeshServiceNotifications.kt

@@ -61,6 +61,10 @@ class MeshServiceNotifications(
     // We have two notification channels: one for general service status and another one for messages
     val notifyId = 101
 
+    fun clearNotifications() {
+        notificationManager.cancelAll()
+    }
+
     fun initChannels() {
         // create notification channels on service creation
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {