Use a bit more visible PS2 (and consistent with PS1)

dotfiles/bash/post.bashrc

@@ -59,7 +59,7 @@ __bashum__mkps1() {
 
 #shellcheck disable=SC2154
 __bashum__mkps2() {
-    echo "$white>$yellow>$lyellow>$normal "
+    echo "$lwhite·$blue>$yellow>$white>$normal "
 }
 
 # and use to assemble own PS1