[0.4.8] revert "[RTL] find_string_index: name parameter may not be null terminated"

This reverts commit 0.4.8-dev-501-g
51c6942

An addendum to my last 0.4.8-commit reverting most sxs-works.
It aims to prevent CORE-14475 which probably has been introduced
by reverting only partially before.
I tested resulting state for more than a week and could
not trigger CORE-14475 any longer.

Author: JoachimHenze

sdk/lib/rtl/actctx.c

@@ -3227,8 +3227,7 @@ static struct string_index *find_string_index(const struct strsection_header *se
         {
             const WCHAR *nameW = (WCHAR*)((BYTE*)section + iter->name_offset);
 
-            if (!_wcsnicmp(nameW, name->Buffer, name->Length / sizeof(WCHAR)) && 
-                wcslen(nameW) == name->Length / sizeof(WCHAR))
+            if (!strcmpiW(nameW, name->Buffer))
             {
                 index = iter;
                 break;