Add warning prompt to mass_storage

mass_storage/main.py

@@ -11,6 +11,10 @@ import ugfx, tilda, ugfx_helper, dialogs, app, time
 ugfx_helper.init()
 ugfx.clear()
 
+user_agreed = dialogs.prompt_boolean("Note: enabling mass storage is slightly risky, as the badge may end up factory "
+                                     "resetting even if you safely eject it. Do you want to continue?")
+
+if user_agreed:
     print("enabling USB storage...")
     tilda.storage_enable_usb()
     time.sleep(1)
@@ -20,3 +24,5 @@ with dialogs.WaitingMessage(title="Mass Storage Enabled", text="You can now use
         tilda.storage_disable_usb()
         print("DONE")
         app.restart_to_default()
+else:
+    app.restart_to_default()