Posh-GIT-HG ကို ဘယ်လိုဖျက်ရမလဲ

A altered profile prompt function to allow Posh-HG and Posh-Git to function on the same machine. This is based on a StackOverflow answer that posted a profile script modifying a user's powershell prompt to play nice with both Posh-HG and Posh-GIT.