reset idle timer each time a new swap screen is loaded

This means that as long as the user is using swap, it'll stay running.

app/src/full/java/org/fdroid/fdroid/localrepo/SwapService.java

@@ -484,7 +484,11 @@ public class SwapService extends Service {
         }
     }
 
-    private void initTimer() {
+    /**
+     * Sets or resets the idel timer for {@link #TIMEOUT}ms, once the timer
+     * expires, this service and all things that rely on it will be stopped.
+     */
+    public void initTimer() {
         if (timer != null) {
             Utils.debugLog(TAG, "Cancelling existing timeout timer so timeout can be reset.");
             timer.cancel();

app/src/full/java/org/fdroid/fdroid/views/swap/SwapWorkflowActivity.java

@@ -472,6 +472,8 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     }
 
     public void inflateSwapView(@LayoutRes int viewRes) {
+        getSwapService().initTimer();
+
         container.removeAllViews();
         View view = ((LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE)).inflate(viewRes, container, false);
         currentView = (SwapView) view;