dtlaunch: Bangle 2: Don't leave cache file after uninstalling

apps/dtlaunch/ChangeLog

@@ -35,3 +35,4 @@ when moving pages. Add caching for faster startups.
 0.28: Bangle 2: Fix showClocks and showLaunchers settings not taking effect by
       clearing cache when changing those settings.
       Bangle 2: Use a separate cache file from the standard launcher.
+      Bangle 2: Don't leave cache file after uninstalling the app.

apps/dtlaunch/metadata.json

@@ -16,5 +16,8 @@
     {"name":"dtlaunch.settings.js","url":"settings-b2.js", "supports": ["BANGLEJS2"]},
     {"name":"dtlaunch.img","url":"app-icon.js","evaluate":true}
   ],
-  "data": [{"name":"dtlaunch.json"}]
+  "data": [
+    {"name":"dtlaunch.json"},
+    {"name":"dtlaunch.cache.json"}
+  ]
 }