passrs.fish: fix trimming

I figured `string trim -r -c ".gpg"` would remove `.gpg` literally from
the end of whatever line it was given. However, it removes the
characters `.`, `g`, and `p` from the end, not caring about the order,
leading to `entry/otp.gpg` being completed as `entry/ot`. Replace with a
regex `string replace`. Likewise for removing the store path.

Author: cole-h

completions/passrs.fish

@@ -15,12 +15,12 @@ end
 
 function __fish_passrs_entries
     set -l store (__fish_passrs_store)
-    printf "%s\n" "$store"/**.gpg | string trim -l -c "$store" | string trim -r -c ".gpg"
+    printf "%s\n" "$store"/**.gpg | string replace -r "$store"'/(.*)' '$1' | string replace -r '(.*)\.gpg' '$1'
 end
 
 function __fish_passrs_dirs
     set -l store (__fish_passrs_store)
-    printf "%s\n" "$store"/**/ | string trim -l -c "$store"
+    printf "%s\n" "$store"/**/ | string replace -r "$store"'/(.*)' '$1'
 end
 
 function __fish_passrs_all