eshell: alias clear to clear-scrollback

This is more in line with how clear behaves in shells.

modules/emacs/eshell/config.el

@@ -24,7 +24,8 @@ buffer.")
     ("bd" "eshell-up $1")   ; `eshell-up'
     ("rg" "rg --color=always")
     ("ag" "ag --color=always")
-    ("ll" "ls -lah"))
+    ("ll" "ls -lah")
+    ("clear" "clear-scrollback")) ; more sensible than default
   "An alist of default eshell aliases, meant to emulate useful shell utilities,
 like fasd and bd. Note that you may overwrite these in your
 `eshell-aliases-file'. This is here to provide an alternative, elisp-centric way