don't try to open in new window by default, tdf#70959

This fixes a regression from 99932fa89be0e041abf5ce5da3271600c841ff19

Change-Id: Idcee34c97173fb79503a560f5246230a9bfaeb51
diff --git a/sc/source/core/data/global.cxx b/sc/source/core/data/global.cxx
index e764bfe..e9df005 100644
--- a/sc/source/core/data/global.cxx
+++ b/sc/source/core/data/global.cxx
@@ -901,7 +901,8 @@ void ScGlobal::OpenURL(const OUString& rURL, const OUString& rTarget, const SdrM
    }
    SfxStringItem aUrl( SID_FILE_NAME, rURL );
    SfxStringItem aTarget( SID_TARGETNAME, rTarget );
    aTarget.SetValue("_blank");
    if ( nScClickMouseModifier & KEY_SHIFT )     // control-click -> into new window
        aTarget.SetValue("_blank");
    SfxViewFrame* pFrame = nullptr;
    OUString aReferName;
    if ( pScActiveViewShell )