jj: Revert js to simple jj status alias

I have gotten more used to using `jw` to 'show' the current changes in
the working copy, and having `js` be _both_ status and show has become
more confusing than helpful. For now, we just revert it to be a simple
alias for the status command.

vcs/jj/config/sh/alias.d/jj.sh

@@ -14,13 +14,7 @@ alias jds="jj describe"
 alias jc="jj commit"
 
 # finding out the current snapshot
-js() {
-    if [ "$#" -eq 0 ]; then
-        jj status
-    else
-        jj show "$*"
-    fi
-}
+alias js="jj status"
 alias jw="jj show"
 alias jd="jj diff"