Tweaked fix for 312346 - enable OK button after automatically filling in Alt Text field in dialog

cmd/winfe/edprops.cpp

@@ -6746,6 +6746,7 @@ void CImagePage::AutoFillAltText()
             m_csAltText = XP_STRDUP(pName);
             XP_FREE(pName);
         }
+        SetOKEnable();
     }
 }
 void CImagePage::OnEditImage()