Move the cleanup() function from Onionshare class to Web class, so that the list of files to be cleaned up is always available (needed for website temp files)

desktop/src/onionshare/tab/mode/__init__.py

@@ -382,7 +382,7 @@ class Mode(QtWidgets.QWidget):
             except Exception:
                 # Probably we had no port to begin with (Onion service didn't start)
                 pass
-        self.app.cleanup()
+        self.web.cleanup()
 
         self.stop_server_custom()
 

desktop/src/onionshare/tab/mode/share_mode/threads.py

@@ -47,7 +47,7 @@ class CompressThread(QtCore.QThread):
                 self.mode.filenames, processed_size_callback=self.set_processed_size
             )
             self.success.emit()
-            self.mode.app.cleanup_filenames += (
+            self.mode.web.cleanup_filenames += (
                 self.mode.web.share_mode.cleanup_filenames
             )
         except OSError as e:

desktop/src/onionshare/tab/tab.py

@@ -668,7 +668,7 @@ class Tab(QtWidgets.QWidget):
         if self.close_dialog.clickedButton() == self.close_dialog.accept_button:
             self.common.log("Tab", "close_tab", "close, closing tab")
             self.get_mode().stop_server()
-            self.app.cleanup()
+            mode.web.cleanup()
             return True
         # Cancel
         else:
@@ -681,4 +681,4 @@ class Tab(QtWidgets.QWidget):
             self.get_mode().web.stop(self.get_mode().app.port)
             self.get_mode().web_thread.quit()
             self.get_mode().web_thread.wait()
-        self.app.cleanup()
+        self.get_mode().web.cleanup()