plugin android: use callFromThread instead of callLater:

`callLater` is not made to be called outside of main thread, `callFromThread` is the
method to call in this case.

sat/plugins/plugin_misc_android.py

@@ -309,9 +309,11 @@ class AndroidPlugin(object):
         #     "XXX has no attribute 'invoke'" error (looks like the same issue as
         #     https://github.com/kivy/pyjnius/issues/59)
         self.br = BroadcastReceiver(
-            callback=lambda *args, **kwargs: reactor.callLater(0,
-                                                              self.onConnectivityChange),
-            actions=["android.net.conn.CONNECTIVITY_CHANGE"])
+            callback=lambda *args, **kwargs: reactor.callFromThread(
+                self.onConnectivityChange
+            ),
+            actions=["android.net.conn.CONNECTIVITY_CHANGE"]
+        )
         self.br.start()
 
     @property