Default colorscheme: Change pager prefix color for light terminals

From my checks (gnome-terminal with the "gnome light" colorscheme)
this seems to be the only color that's barely visible in a light
terminal, and it's the only color mentioned in both bug reports.

I'm leaving the artistic decisions to others, this is now *acceptable*
in both.

Note that, because we use universal variables here (hint #7317), this
will only be changed for preexisting installations when the user
reloads the colorscheme.

Fixes #3412
Fixes #3893

share/functions/__fish_config_interactive.fish

@@ -62,7 +62,7 @@ function __fish_config_interactive -d "Initializations that should be performed
         __init_uvar fish_color_cancel -r
 
         # Pager colors
-        __init_uvar fish_pager_color_prefix white --bold --underline
+        __init_uvar fish_pager_color_prefix normal --bold --underline
         __init_uvar fish_pager_color_completion
         __init_uvar fish_pager_color_description B3A06D yellow
         __init_uvar fish_pager_color_progress brwhite --background=cyan

share/tools/web_config/js/colorutils.js

@@ -241,7 +241,7 @@ var color_scheme_fish_default = {
     'search_match' : 'bryellow --background=brblack',
     'fish_pager_color_completion' : '',
     'fish_pager_color_description' : 'B3A06D yellow',
-    'fish_pager_color_prefix' : 'white --bold --underline',
+    'fish_pager_color_prefix' : 'normal --bold --underline',
     'fish_pager_color_progress' : 'brwhite --background=cyan',
     'normal' : 'normal',
     'user' : 'brgreen',