Use primary menu instead of gtk/menus.ui

Part of the 3.32 initiative to get rid of the app menu.

data/gtk/menus.ui

@@ -1,17 +0,0 @@
-<?xml version="1.0"?>
-<interface>
-  <!-- interface-requires gtk+ 3.0 -->
-  <menu id="app-menu">
-    <section>
-      <item>
-        <attribute name="label" translatable="yes">_About</attribute>
-        <attribute name="action">app.about</attribute>
-      </item>
-      <item>
-        <attribute name="label" translatable="yes">_Quit</attribute>
-        <attribute name="action">app.quit</attribute>
-        <attribute name="accel">&lt;Primary&gt;q</attribute>
-      </item>
-    </section>
-  </menu>
-</interface>

data/teleport.gresource.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
   <gresource prefix="/com/frac_tion/teleport">
-    <file alias="gtk/menus.ui">gtk/menus.ui</file>
     <file preprocess="xml-stripblanks">window.ui</file>
     <file preprocess="xml-stripblanks">settings.ui</file>
     <file preprocess="xml-stripblanks">device_settings.ui</file>