Select full item name upon entering edit mode in the collection tree

(Instead of placing the cursor at the end of the edit field)
Closes #2316

chrome/content/zotero/collectionTree.jsx

@@ -292,6 +292,7 @@ var CollectionTree = class CollectionTree extends LibraryTree {
 			// Feels like a bit of a hack, but it gets the job done
 			setTimeout(() => {
 				label.focus();
+				label.select();
 			});
 		}