Related tdf#118547: Lock mark on protected sheet tab

Fix opposite case, see https://bugs.documentfoundation.org/show_bug.cgi?id=118547#c10

Change-Id: I2c4e55f8929b1979e71a4040dfac1ba7cff51aeb
Reviewed-on: https://gerrit.libreoffice.org/59035
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

sc/source/ui/view/viewfunc.cxx

@@ -2549,7 +2549,11 @@ bool ScViewFunc::Unprotect( SCTAB nTab, const OUString& rPassword )
     bool bUndo (rDoc.IsUndoEnabled());
 
     if ( nTab == TABLEID_DOC || rMark.GetSelectCount() <= 1 )
+    {
         bChanged = rFunc.Unprotect( nTab, rPassword, false );
+        if (bChanged)
+            SetTabProtectionSymbol(nTab, false);
+    }
     else
     {
         //  modifying several tabs is handled here