Remove unused X-KDE-ModuleType

It's not read by anything

src/kded/kded_accounts.json

@@ -83,6 +83,5 @@
     },
     "OnlyShowIn": "KDE;",
     "X-KDE-Kded-autoload": true,
-    "X-KDE-Kded-phase": 1,
-    "X-KDE-ModuleType": "Library"
+    "X-KDE-Kded-phase": 1
 }