fix: remove undesired work_in_progress function from the git plugin

Author: jdbruijn

zsh/custom/functions.zsh

@@ -1,3 +1,8 @@
 for function ("${ZSH_CUSTOM}/functions/"*.zsh); do
   source "${function}"
 done
+
+# The `work_in_progress` function is from the `git` plugin. This function is
+# conflicting with the zsh-autosuggestions for navigating to Git worktrees,
+# making naviation to worktrees slightly annoying.
+unfunction work_in_progress # From the git plugin