Changed \u and \U to reflect number of hex digits to follow
Changed \u and \U to reflect number of hex digits to follow

Some unicode icon strings were set with \uHHHHH which showed the wrong
characters on some implementations of zsh (linux and macOS).  Changed
\uHHHHH to \UHHHHH and conversely changed \UHHHH to \uHHHH.

shibumi/powerlevel9k,dritter/powerlevel9k,natemccurdy/powerlevel9k,MarvinTeichmann/powerlevel9k,shibumi/powerlevel9k,dritter/powerlevel9k,zer4tul/dotfiles,rjorgenson/powerlevel9k,bhilburn/powerlevel9k,zer4tul/dotfiles,rjorgenson/powerlevel9k,bhilburn/powerlevel9k,MarvinTeichmann/powerlevel9k,natemccurdy/powerlevel9k