libroot/locale: Allow global locales to be applied to the current thread.

I added this assertion thinking it would incorrectly override
thread locales, and that invocationns this way would be a bug.
Instead it appears that this is the expected behavior in select
circumstances.

Fixes #19896 and other recent regressions.

src/system/libroot/posix/locale/LocaleDataBridge.cpp

@@ -47,9 +47,6 @@ LocaleCtypeDataBridge::LocaleCtypeDataBridge(bool isGlobal)
 void
 LocaleCtypeDataBridge::ApplyToCurrentThread()
 {
-	if (isGlobal)
-		abort();
-
 	ThreadLocale* threadLocale = GetCurrentThreadLocale();
 	threadLocale->ctype_b = *addrOfClassInfoTable;
 	threadLocale->ctype_tolower = *addrOfToLowerTable;