Update powerlevel9k to 0.6.7

Changes

• Fix home dir shortening when using package_name truncation strategy
• Fix package name path truncation inside home dir
• Fix issues with debug/fonts script in Konsole
• Only abbreviate $HOME at the beginning of cwd
• Remove checking for NODEENV_DISABLE_PROMPT
• Fix newlines in ZSH 5.7
• Avoid error if /etc/os-release does not exist
• Fix icons cut off in RPROMPT segments
• Speedup Improvements in vcs segment

Still using the theme and can confirm it works