Add missing final newlines

Used this one-liner: https://unix.stackexchange.com/a/161853

src/legacy/dashboard.js

@@ -17,4 +17,4 @@ Dashboard.confirm = function(message, title, callback) {
     require(["loading"], function(loading) {
         loading.hide()
     })
-};
+};

src/legacy/fnchecked.js

@@ -7,4 +7,4 @@ define(["jQuery"], function($) {
     }, $.fn.checkboxradio = function() {
         return this
     }
-});
+});

src/legacy/selectmenu.js

@@ -3,4 +3,4 @@ define(["jQuery"], function($) {
     $.fn.selectmenu = function() {
         return this
     }
-});
+});