AK: Eradicate calls to warn().

Author: https://github.com/asynts
Commit: 1254cbbd0b
Pull-request: https://github.com/SerenityOS/serenity/pull/3848

Applications/Browser/main.cpp

@@ -63,7 +63,7 @@ static String bookmarks_file_path()
 int main(int argc, char** argv)
 {
     if (getuid() == 0) {
-        warn() << "Refusing to run as root";
+        warnln("Refusing to run as root");
         return 1;
     }