wallet: remove custom index in invoice popup

src/view/wallet/wallet.glade

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.38.2 -->
+<!-- Generated with glade 3.40.0 -->
 <interface>
   <requires lib="gtk+" version="3.22"/>
   <object class="GtkMenu" id="address_menu">
@@ -322,7 +322,6 @@
         <child>
           <object class="GtkCheckButton" id="index_chk">
             <property name="label" translatable="yes">Use custom address no:</property>
-            <property name="visible">True</property>
             <property name="can-focus">True</property>
             <property name="receives-default">False</property>
             <property name="draw-indicator">True</property>
@@ -350,7 +349,6 @@
         </child>
         <child>
           <object class="GtkSpinButton" id="index_stp">
-            <property name="visible">True</property>
             <property name="sensitive">False</property>
             <property name="can-focus">True</property>
             <property name="text" translatable="yes">0</property>
@@ -373,7 +371,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="currency_lbl">
             <property name="visible">True</property>
             <property name="can-focus">False</property>
             <property name="label" translatable="yes">BTC</property>