move update code into function

base/updates.zsh

@@ -1,4 +1,5 @@
-if type git &> /dev/null && (( _zeesh_fresh_install != 1 )); then
+function zeesh_update () {
+    if type git &> /dev/null && (( _zeesh_fresh_install != 1 )); then
         ticker_message "zeesh: pulling from git" # TODO: less frequently, and background
         start_dir="$(pwd)"
     
@@ -18,4 +19,7 @@ if type git &> /dev/null && (( _zeesh_fresh_install != 1 )); then
         fi
         
         [[ _zshrc_updates_pending -eq 1 ]] && ticker_message "zeesh: stub updates pending"
-fi
+    fi
+}
+
+zeesh_update