[Fish] Change the order of the $PATH variable

Custom and local executables will now have the priority over system
executables.
For instance, an `ls' executable located in `$HOME/.local/bin/ls' will
have the priority over `/bin/ls'

org/config/fish.org

@@ -223,7 +223,7 @@
    #+BEGIN_SRC fish :noweb yes
      for p in <<generate-extra-paths()>>
          if status is-login
-             contains $p $PATH || set PATH $PATH $p
+             contains $p $PATH || set PATH $p $PATH
          end
      end
    #+END_SRC