fx-compat: Update CSL Edit window

chrome/content/zotero/preferences/preferences.xul

@@ -648,7 +648,7 @@
 						<hbox>
 							<button id="openCSLEdit"
 								label="&zotero.preferences.styleEditor;"
-								oncommand="Zotero_Preferences.openInViewer('chrome://zotero/content/tools/csledit.xul', true)"/>
+								oncommand="Zotero_Preferences.openInViewer('chrome://zotero/content/tools/csledit.xhtml', true)"/>
 							<button id="openCSLPreview"
 								label="&zotero.preferences.stylePreview;"
 								oncommand="Zotero_Preferences.openInViewer('chrome://zotero/content/tools/cslpreview.xul', true)"/>

chrome/content/zotero/standalone/standalone.js

@@ -904,7 +904,7 @@ function openRunJSWindow() {
 
 function openStyleEditor() {
 	openWindowByType(
-		'chrome://zotero/content/tools/csledit.xul',
+		'chrome://zotero/content/tools/csledit.xhtml',
 		'zotero:style-editor',
 		'chrome,width=950,height=700,resizable'
 	);