Prevent multipe 'show my tags' lines appearing when uploading more than one...

Prevent multipe 'show my tags' lines appearing when uploading more than one file in My Files. Fixes #2029

htdocs/artefact/file/js/file.js

@@ -534,7 +534,7 @@ function FileUploader(element, uploadscript, statevars, foldername, folderid, up
             self.form.userfile.value = '';
             self.form.title.value = '';
             self.form.description.value = '';
-            swapDOM(self.form.tags.parentNode.parentNode.parentNode.parentNode, create_tags_control('tags'));
+            swapDOM('tagcontrol-tags', create_tags_control('tags'));
             hideElement(self.form.replace);
             hideElement(self.form);
             showElement(self.openbutton);

htdocs/js/mahara.js

@@ -589,7 +589,7 @@ function create_tags_control(name, value, options) {
     elements.push(augment_tags_control(tagControl, true));
     elements.push(TABLE({'class': 'help-wrapper'}, TBODY(null, TR(null, TD(null, tagControl), TD({'class': 'helpcontainer'}, tagshelp)))));
 
-    return DIV(null, elements);
+    return DIV({'id': 'tagcontrol-' + name}, elements);
 }
 
 // this function takes an existing input element and augments it