__fish_print_help: remove spurious bold/underline control characters

Commit d15a51897 ("Rationalize $LESS uses") switched a "less" flag
from -r (interpret all control characters)
  to -R (interpret only color codes)

Somehow this changed the output of "fish -c 'command -h'" to include
weird characters:

	DESCRIPTION^O
	command^O forces the shell to execute the program COMMANDNAME^O and ignore any functions or builtins with the same name.

Probably this was the reason why I originally used -r over -R.  Anyway,
-R is safer and it looks like we can just remove the "ul" preprocessing
since "less" will interpret bold/underline just fine.

share/functions/__fish_print_help.fish

@@ -111,7 +111,7 @@ function __fish_print_help --description "Print help message for the specified f
                     end
             end
         end
-    end | string replace -ra '^       ' '' | ul | # post-process with `ul`, to interpret the old-style grotty escapes
+    end | string replace -ra '^       ' '' |
         begin
             set -l pager less
             set -q PAGER