changed variable PRE_1_7_2_GIT to POST_1_7_2_GIT to make it more accurate

lib/git.zsh

@@ -8,7 +8,7 @@ function git_prompt_info() {
 # Checks if working tree is dirty
 parse_git_dirty() {
   local SUBMODULE_SYNTAX=''
-  if [[ PRE_1_7_2_GIT -gt 0 ]]; then
+  if [[ POST_1_7_2_GIT -gt 0 ]]; then
         SUBMODULE_SYNTAX="--ignore-submodules=dirty"
   fi
   if [[ -n $(git status -s ${SUBMODULE_SYNTAX}  2> /dev/null) ]]; then
@@ -70,7 +70,7 @@ git_prompt_status() {
 }
 
 #this is unlikely to change so make it all statically assigned
-PRE_1_7_2_GIT=$(git_compare_version "1.7.2")
+POST_1_7_2_GIT=$(git_compare_version "1.7.2")
 #clean up the namespace slightly by removing the checker function
 unset -f git_compare_version()