Z7: Fix Add Item by Identifier tests (and rename textbox)

Now only one textbox, so no need to call it 'multiline'

chrome/content/zotero/lookup.js

@@ -174,7 +174,7 @@ var Zotero_Lookup = new function () {
 		// Ignore context menu
 		if (event.originalTarget.id != 'zotero-lookup-panel') return;
 		
-		document.getElementById("zotero-lookup-multiline-textbox").value = "";
+		document.getElementById("zotero-lookup-textbox").value = "";
 		Zotero_Lookup.setShowProgress(false);
 		
 		// Revert to single-line when closing
@@ -228,7 +228,7 @@ var Zotero_Lookup = new function () {
 	
 	
 	this.setMultiline = function (on) {
-		var mlTxtBox = document.getElementById("zotero-lookup-multiline-textbox");
+		var mlTxtBox = document.getElementById("zotero-lookup-textbox");
 		var mlButtons = document.getElementById('zotero-lookup-buttons');
 
 		mlTxtBox.rows = on ? 5 : 1;
@@ -248,7 +248,7 @@ var Zotero_Lookup = new function () {
 		// In Firefox 52.6.0, progressmeters burn CPU at idle on Linux when undetermined, even
 		// if they're hidden. (Being hidden is enough on macOS.)
 		
-		document.getElementById("zotero-lookup-multiline-textbox").disabled = !!on;
+		document.getElementById("zotero-lookup-textbox").disabled = !!on;
 		var p = document.getElementById("zotero-lookup-multiline-progress");
 		if (on) {
 			p.removeAttribute('value');

chrome/content/zotero/zoteroPane.xhtml

@@ -775,7 +775,7 @@
 											<label>&zotero.lookup.description;</label>
 											<vbox id="zotero-lookup-multiline">
 												<html:textarea
-													id="zotero-lookup-multiline-textbox"
+													id="zotero-lookup-textbox"
 													onkeypress="Zotero_Lookup.onKeyPress(event, this)"
 													oninput="Zotero_Lookup.onInput(event, this)"
 													rows="1"
@@ -783,7 +783,7 @@
 												<hbox id="zotero-lookup-buttons" align="start" hidden="true">
 													<button
 														align="start"
-														oncommand="Zotero_Lookup.accept(document.getElementById('zotero-lookup-multiline-textbox'))"
+														oncommand="Zotero_Lookup.accept(document.getElementById('zotero-lookup-textbox'))"
 														label="&zotero.lookup.button.search;"/>
 													<html:progress id="zotero-lookup-multiline-progress" value="0" hidden="true" style="-moz-box-flex: 1"/>
 												</hbox>

chrome/skin/default/zotero/overlay.css

@@ -291,7 +291,7 @@
 	list-style-image: url('chrome://zotero/skin/toolbar-lookup.png');
 }
 
-#zotero-lookup-textbox, #zotero-lookup-multiline-textbox {
+#zotero-lookup-textbox {
 	margin: 4px;
 	padding: 2px;
 	-moz-box-flex: 1;