tdf#118547: Remove lock mark only if password is correct

Change-Id: I9f5731dfaaf9b4cc67e600a8b1c01709e7c9ba99
Reviewed-on: https://gerrit.libreoffice.org/57044
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>

sc/source/ui/view/viewfunc.cxx

@@ -2557,10 +2557,11 @@ bool ScViewFunc::Unprotect( SCTAB nTab, const OUString& rPassword )
             pDocSh->GetUndoManager()->LeaveListAction();
     }
 
-    SetTabProtectionSymbol(nTab, false);
-
     if (bChanged)
+    {
+        SetTabProtectionSymbol(nTab, false);
         UpdateLayerLocks();     //! broadcast to all views
+    }
 
     return bChanged;
 }