Add Menlo to monospace font stack

lest it be Courier on iOS

html_orig/jssrc/term_screen.js

@@ -73,7 +73,7 @@ class TermScreen {
       width: 0,
       height: 0,
       devicePixelRatio: 1,
-      fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", monospace',
+      fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", "Menlo", monospace',
       fontSize: 20,
       gridScaleX: 1.0,
       gridScaleY: 1.2,

html_orig/sass/app.scss

@@ -20,7 +20,7 @@ $c-form-highlight-a: #2ea1f9;
 
 $c-modal-bg: #242426;
 
-$screen-stack: "DejaVu Sans Mono", "Liberation Mono", "Inconsolata", monospace;
+$screen-stack: "DejaVu Sans Mono", "Liberation Mono", "Inconsolata", "Menlo", monospace;
 
 @function dist($x) {
 	@return modular-scale($x, 1rem, $golden);