Update application manifest.

application.fam

@@ -3,13 +3,10 @@ App(
     name="Metronome",
     apptype=FlipperAppType.EXTERNAL,
     entry_point="metronome_app",
-    cdefines=["APP_METRONOME"],
-    requires=[
-        "gui",
-    ],
-    fap_icon="metronome_icon.png",
+    requires=["gui"],
+    fap_icon="metronome_10x.png",
     fap_icon_assets="icons",
-    fap_category="Music",
+    fap_category="Media",
     stack_size=2 * 1024,
     order=20,
 )