zsh:conf: Remove trailing slashes before processing

Previously when the program name had a trailing slash, `conf` would not
find the right file as it would check for filenames that include a slash
(e.g. `prog/rc`). This was especially annoying, since conf's completion
function inserts a slash automatically when subdirectories exists.

.config/zsh/zshrc.d/40-functions.zsh

@@ -90,6 +90,10 @@ conf() {
 		printf "\033[1;31mPlease specify a config.\n\033[0m" >&2
 		return 1
 	fi
+
+	# remove trailing slashes
+	1="${(*)1%%/#}"
+
 	# search for program name in XDG_CONFIG_HOME and $HOME
 	local CONF_DIR="$(_get_config_dir "$1")"
 	if (( $? )); then