Remove numerical input spinners for x,y,z settings in Firefox

Chrome/Safari/Edge etc are all set already by the
`.numeric-setting-line-input::-webkit-outer-spin-button`
and
`.numeric-setting-line-input::-webkit-inner-spin-button`

but firefox needs a different line set on the input itself see:
https://www.w3schools.com/howto/howto_css_hide_arrow_number.asp

webapp/src/components/tabContentComponents/navigateComponents/paneNavigate.vue

@@ -386,6 +386,9 @@ export default {
   margin-left: 5px;
   margin-right: 5px;
   width: 3em;
+  /* Stop Firefox showing input spinners, other
+  browsers set with block below */
+  -moz-appearance: textfield;
 }
 /* Chrome, Safari, Edge, Opera */
 .numeric-setting-line-input::-webkit-outer-spin-button,