`_load_settings` needs `set

[serixscorpio]

When bringing my dotfiles up-to-date including the Make _load_settings() more concise commit, I noticed my prompt turned into

It turned out I had to setopt extendedglob as noted by the commit message. I ended up adding this configuration in my zshenv.local so by the time zshrc runs _load_settings, the glob can work correctly. Just wondering if it would make sense for setopt extendedglob to be in thoughtbot dotfiles (zshenv or zshrc?) instead of requiring custom config for _load_settings to work?

[geoffharcourt]

cc: @thoughtbot/shell