analogROI: Activate save button after ROI creation (#2326)

sd-card/html/edit_analog.html

@@ -326,6 +326,7 @@ function UpdateROIs(_sel){
         document.getElementById("deleteROI").disabled = false;
         document.getElementById("renameROI").disabled = false;
         document.getElementById("index").disabled = false;
+        document.getElementById("saveroi").disabled = false;
     }
 
     var _index = document.getElementById("index");