Minor fixes and code cleanup in Single_line_Ubuntu theme.

themes/Single_line_Ubuntu.bgptheme

@@ -1,4 +1,5 @@
 # This is an alternative approach. Single line in git repo.
+# Theme optimised for Terminus and PowerLine compatible fonts.
 
 unset_git_prompt_colors() {
   unset Time12a
@@ -66,10 +67,11 @@ define_undefined_git_prompt_colors() {
   if [[ -z ${GIT_PROMPT_VIRTUALENV} ]]; then GIT_PROMPT_VIRTUALENV="(${Blue}_VIRTUALENV_${ResetColor}) "; fi
 
   # _LAST_COMMAND_INDICATOR_ will be replaced by the appropriate GIT_PROMPT_COMMAND_OK OR GIT_PROMPT_COMMAND_FAIL
-  if [[ -z ${GIT_PROMPT_START_USER} ]]; then GIT_PROMPT_START_USER="_LAST_COMMAND_INDICATOR_ ${White}${Time12a}${ResetColor} ${BoldYellow}${PathShort}${ResetColor}"; fi
+  if [[ -z ${GIT_PROMPT_START_USER} ]]; then GIT_PROMPT_START_USER="_LAST_COMMAND_INDICATOR_ ${White}${Time12a}${ResetColor} ${Cyan}${PathShort}${ResetColor}"; fi
+
   if [[ -z ${GIT_PROMPT_START_ROOT} ]]; then GIT_PROMPT_START_ROOT="${GIT_PROMPT_START_USER}"; fi
-  if [[ -z ${GIT_PROMPT_END_USER} ]]; then GIT_PROMPT_END_USER="${ResetColor} $ "; fi
+  if [[ -z ${GIT_PROMPT_END_USER} ]]; then GIT_PROMPT_END_USER="${ResetColor} $ "; fi  # Reset color for user
-  if [[ -z ${GIT_PROMPT_END_ROOT} ]]; then GIT_PROMPT_END_ROOT="${BoldRed} # "; fi
+  if [[ -z ${GIT_PROMPT_END_ROOT} ]]; then GIT_PROMPT_END_ROOT="${BoldRed} # "; fi     # Bright red for Root
 
   # Please do not add colors to these symbols
   if [[ -z ${GIT_PROMPT_SYMBOLS_AHEAD} ]]; then GIT_PROMPT_SYMBOLS_AHEAD="↑·"; fi     # The symbol for "n versions ahead of origin"