[zsh] Replace implementation of init_path with update-path call

Rename this function with hyphens instead of underscores.

zsh/func/init-path

@@ -0,0 +1,26 @@
+# Eryn Wells <eryn@erynwells.me>
+
+autoload -Uz update-path
+
+function init-path
+{
+    update-path \
+        "$HOME/bin" \
+        "$HOME/.local/bin" \
+        "$HOME/.cargo/bin" \
+        "$HOME/.ghcup/bin" \
+        "$HOME/.gem/ruby/2.2.0/bin" \
+        "$HOME/.vim/bundle/vim-tidal/bin" \
+        /opt/local/bin \
+        /usr/X11/bin \
+        /opt/brew/bin \
+        /opt/homebrew/bin \
+        /usr/local/bin \
+        /usr/bin \
+        /bin \
+        /usr/local/sbin \
+        /usr/sbin \
+        /sbin
+}
+
+init-path "$@"