Simplify TTY detection slightly further

: is a bash built-in equivalent to 'true', which does nothing, but still
checks the TTY because it's still given the redirection.

Author: pimterry

notes

@@ -204,7 +204,7 @@ open_note() {
 
     note_path=$( get_full_note_path "$note_path" )
 
-    if bash -c "printf '' >/dev/tty" >/dev/null 2>/dev/null; then
+    if bash -c ": >/dev/tty" >/dev/null 2>/dev/null; then
         $EDITOR "$note_path" </dev/tty
     else
         $EDITOR "$note_path"