Change the prompt again.

As expected there was a lot of bikeshedding.

Just change the color of the path, green on success, red on failure.

Constraints taken into account:
- Keep the > for now
- Prompt should be as compact as possible for those of us using 80
  column terminals.
- Prompt should not change size between success and error cases

Not taken into account:
- The feature should be accessible to colorblind people (we could
  replace the > with another char but we couldn't find something that
  looks suitable)

data/etc/profile

@@ -6,15 +6,15 @@
 ARCH=`getarch 2>/dev/null`
 if [ "$ARCH" = "`getarch -p 2>/dev/null`" ] ; then
 	echo -e "\nWelcome to the Haiku shell.\n"
-	PS1="\w "
+	PS1="\w"
 else
 	echo -e "\nSwitching to architecture `getarch`\n"
-	PS1="[$ARCH] \w "
+	PS1="[$ARCH] \w"
 fi
 unset ARCH
 
-PS1="$PS1"'`if [ $? = 0 ]; then echo "\e[32m:)\e[0m\]";	else \
-	echo "\e[31;1m\]:(\e[0m\]"; fi` \e[0m\]$ '
+PS1='`if [ $? = 0 ]; then echo "\e[32m";
+	else echo "\e[31m\]"; fi`'"$PS1\e[0m\]> "
 
 export USER=`id -un`
 export GROUP=`id -gn`