Re fdo#80538: Remove read-only infobar after "Save As..."

...on a doc in r/o mode, which will switch to the newly saved document in r/w
mode.  Was missing from c6270de939d5ee51b61dc4ac02c52f1d9b5b1e47 "fdo#80538 Show
an infobar when document is in read-only mode."

Change-Id: Ie17f4213f989cb4b9d3f7fc114392ec6f516a965
diff --git a/sfx2/source/doc/objserv.cxx b/sfx2/source/doc/objserv.cxx
index 7bc7712..0edb0e8 100644
--- a/sfx2/source/doc/objserv.cxx
+++ b/sfx2/source/doc/objserv.cxx
@@ -728,6 +728,7 @@ void SfxObjectShell::ExecFile_Impl(SfxRequest &rReq)

            if ( nId == SID_SAVEASDOC  && nErrorCode == ERRCODE_NONE )
            {
                GetFrame()->RemoveInfoBar("readonly");
                SetReadOnlyUI(false);
            }