Override back press to properly clean up

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/build.gradle

@@ -12,8 +12,8 @@ android {
         targetSdkVersion 27
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
-        versionCode 8
-        versionName "1.0.0"
+        versionCode 9
+        versionName "1.0.1"
 
         // Enabling multidex support.
         multiDexEnabled true

app/src/main/java/com/nextcloud/talk/activities/CallActivity.java

@@ -1362,6 +1362,10 @@ public class CallActivity extends AppCompatActivity {
                         }
                     }
                 });
+    }
 
+    @Override
+    public void onBackPressed() {
+        onHangupClick();
     }
 }