Automatic fap category for extmainapp

applications/main/xtreme_app/application.fam

@@ -12,6 +12,5 @@ App(
     icon="A_Xtreme_14",
     order=90,
     fap_libs=["assets"],
-    fap_category=".Main",
     fap_icon="xtreme_app_10px.png",
 )

scripts/fbt_tools/fbt_extapps.py

@@ -176,7 +176,7 @@ class AppBuilder:
                         deployable = False
                 app_artifacts.dist_entries.append((deployable, fal_path))
         else:
-            fap_path = f"apps/{self.app.fap_category}/{app_artifacts.compact.name}"
+            fap_path = f"apps/{'.Main' if self.app.apptype == FlipperAppType.EXTMAINAPP else self.app.fap_category}/{app_artifacts.compact.name}"
             app_artifacts.dist_entries.append(
                 (self.app.is_default_deployable, fap_path)
             )