Fix some edge cases when nerd fonts are on and powerline fonts are explicitly disabled.

fish_prompt.fish

@@ -393,7 +393,7 @@ function __bobthefish_finish_segments -S -d 'Close open prompt segments'
 
         if set -q theme_newline_prompt
             echo -ens "$theme_newline_prompt"
-        else if [ "$theme_powerline_fonts" = "no" ]
+        else if [ "$theme_powerline_fonts" = "no" -a "$theme_nerd_fonts" != "yes" ]
             echo -ns '> '
         else
             echo -ns "$right_arrow_glyph "

fish_right_prompt.fish

@@ -68,7 +68,7 @@ end
 
 function fish_right_prompt -d 'bobthefish is all about the right prompt'
     set -l __bobthefish_left_arrow_glyph \uE0B3
-    if [ "$theme_powerline_fonts" = "no" ]
+    if [ "$theme_powerline_fonts" = "no" -a "$theme_nerd_fonts" != "yes" ]
         set __bobthefish_left_arrow_glyph '<'
     end