Fix line-wrapping problem (#47)

The problem was caused by the symbol definitions, e.g. \xE2\x89\xA1 for the ≡ symbol. As per https://unix.stackexchange.com/a/468983/200655

Bash cannot calculate the length [of wide unicode symbols] correctly, so easiest way could be to escape 2 out of three parts of those wide symbols.

i.e. \[\xE2\x89\]\xA1

git-prompt.sh

@@ -210,10 +210,10 @@ __posh_git_echo () {
     local BranchBehindAndAheadStatusSymbol=''
     local BranchWarningStatusSymbol=''
     if $EnableStatusSymbol; then
-      BranchIdenticalStatusSymbol=$' \xE2\x89\xA1' # Three horizontal lines
-      BranchAheadStatusSymbol=$' \xE2\x86\x91' # Up Arrow
-      BranchBehindStatusSymbol=$' \xE2\x86\x93' # Down Arrow
-      BranchBehindAndAheadStatusSymbol=$'\xE2\x86\x95' # Up and Down Arrow
+      BranchIdenticalStatusSymbol=$' \[\xE2\x89\]\xA1' # Three horizontal lines
+      BranchAheadStatusSymbol=$' \[\xE2\x86\]\x91' # Up Arrow
+      BranchBehindStatusSymbol=$' \[\xE2\x86\]\x93' # Down Arrow
+      BranchBehindAndAheadStatusSymbol=$'\[\xE2\x86\]\x95' # Up and Down Arrow
       BranchWarningStatusSymbol=' ?'
     fi