Revert "lok: in preinit stage, do not force locale"

Fixes unit-prefork in online for me.

Kendy suggested to also change the forced locale to en-US.UTF-8
instead of just en-US, but that caused:
warn:i18nlangtag:32416:1:i18nlangtag/source/languagetag/languagetag.cxx:1369:
LanguageTagImpl::convertLocaleToLang: with bAllowOnTheFlyID invalid
'en-US.UTF-8'.

This reverts commit c3d25b8b.

Change-Id: I2cd8c50a783918c380505e7a3aaf37d578e76031
Reviewed-on: https://gerrit.libreoffice.org/31489Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

desktop/source/lib/init.cxx

@@ -2939,6 +2939,8 @@ static int lo_initialize(LibreOfficeKit* pThis, const char* pAppPath, const char
                 // Release Solar Mutex, lo_startmain thread should acquire it.
                 Application::ReleaseSolarMutex();
             }
+
+            force_c_locale();
         }
 
         // We could use InitVCL() here -- and used to before using soffice_main,
@@ -2961,8 +2963,6 @@ static int lo_initialize(LibreOfficeKit* pThis, const char* pAppPath, const char
 
         if (eStage != PRE_INIT)
         {
-            force_c_locale();
-
             SAL_INFO("lok", "Enabling RequestHandler");
             RequestHandler::Enable(false);
             SAL_INFO("lok", "Starting soffice_main");