focus on the iframe onload

Also removed dispatched space event onload that doesn't do anything
without cursor

chrome/content/zotero/integration/quickFormat.js

@@ -211,22 +211,11 @@ var Zotero_QuickFormat = new function () {
 				_refocusQfe();
 			})();
 
-			window.focus();
+			qfi.focus();
 			qfe.focus();
 
 			// load citation data
 			if (io.citation.citationItems.length) {
-				// hack to get spacing right
-				let event = new KeyboardEvent(
-					"keypress",
-					{
-						key: " ",
-						code: "Space",
-						bubbles: true,
-						cancelable: true,
-					}
-				);
-				qfe.dispatchEvent(event);
 				await resizePromise;
 				var node = qfe.firstChild;
 				node.nodeValue = "";