[fish] Update virtualfish install

fish/.config/fish/conf.d/virtualfish-loader.fish

@@ -0,0 +1,4 @@
+set -g VIRTUALFISH_VERSION 2.4.0
+set -g VIRTUALFISH_PYTHON_EXEC /home/powellc/.asdf/installs/python/3.8.5/bin/python3.8
+source /home/powellc/.asdf/installs/python/3.8.5/lib/python3.8/site-packages/virtualfish/virtual.fish
+emit virtualfish_did_setup_plugins

fish/.config/fish/config.fish

@@ -8,5 +8,4 @@ set -gx PATH ~/.local/bin $PATH
 fzf_key_bindings
 set -gx EDITOR vi
 set -gx XDG_RUNTIME_DIR /run/user/(id -u)
-eval (python -m virtualfish)
 direnv hook fish | source