Everywhere: Remove unnecessary AK and Detail namespace scoping

Author: https://github.com/moustafaraafat
Commit: b8f1e1bed2
Pull-request: https://github.com/SerenityOS/serenity/pull/16067
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/linusg

AK/Forward.h

@@ -16,7 +16,7 @@ class ByteBuffer;
 }
 
 class Bitmap;
-using ByteBuffer = AK::Detail::ByteBuffer<32>;
+using ByteBuffer = Detail::ByteBuffer<32>;
 class Error;
 class GenericLexer;
 class IPv4Address;