Remove unnecessary argument from call

dotfiles/bash/post.bashrc

@@ -31,7 +31,7 @@ make_ps1() {
     ps1w="$lblue\w$normal";
     ps1G='$(__git_ps1 "(%s)")';
     ps1g="$green$ps1G$normal";
-    ps1D='$(__make_ps1d $?)';
+    ps1D='$(__make_ps1d)';
     ps1d="$red$ps1D$normal";
     echo "$svrc$ps1u@$ps1h:$ps1w$ps1g$ps1d\$ ";
 }