Fixed potential locale issue in parsing -flist

Texdiag/texdiag.cpp

@@ -3434,6 +3434,8 @@ int __cdecl wmain(_In_ int argc, _In_z_count_(argc) wchar_t* argv[])
                     return 1;
                 }
 
+                inFile.imbue(std::locale::classic());
+
                 ProcessFileList(inFile, conversion);
             }
             break;