refactor(carton): utility function main command convention

Author: scop

completions/carton

@@ -2,14 +2,14 @@
 
 _comp_cmd_carton__commands()
 {
-    local cmds=$("${1:-carton}" usage 2>&1 |
+    local cmds=$("$1" usage 2>&1 |
         command sed -ne '/.*command.* is one of/{n;p;q;}')
     _comp_compgen -aF $' \t\n,' -- -W "$cmds"
 }
 
 _comp_cmd_carton__command_help()
 {
-    local help=$(PERLDOC_PAGER=cat PERLDOC=-otext "${1:-carton}" -h "$2" 2>&1)
+    local help=$(PERLDOC_PAGER=cat PERLDOC=-otext "$1" -h "$2" 2>&1)
     _comp_compgen -a -- -W '$help'
 }