Revert "UI: Enable HiDPI scaling."

This reverts commit c4eebbba54717bac6abb1ae22ae1cb492fe212ad.

UI/obs-app.cpp

@@ -1319,8 +1319,6 @@ static int run_program(fstream &logFile, int argc, char *argv[])
 
 	QCoreApplication::addLibraryPath(".");
 
-	QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-
 	OBSApp program(argc, argv, profilerNameStore.get());
 	try {
 		program.AppInit();