These fields can be const

Change-Id: I7012e0d7b65fbb3317719f24572f77fb9aafd910
Reviewed-on: https://gerrit.libreoffice.org/49143Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

include/vbahelper/vbaglobalbase.hxx

@@ -47,8 +47,8 @@ typedef InheritedHelperInterfaceWeakImpl< ov::XGlobalsBase > Globals_BASE;
 class VBAHELPER_DLLPUBLIC VbaGlobalsBase : public Globals_BASE
 {
 protected:
-    OUString msDocCtxName;
-    OUString msApplication;
+    const OUString msDocCtxName;
+    const OUString msApplication;
 
     bool hasServiceName( const OUString& serviceName );
     void init(  const css::uno::Sequence< css::beans::PropertyValue >& aInitArgs );