Add logic for copying ShortDes to LongDesc if it is not present

This is the best place for inserting it that I found.

Test in #2648 should be modified to run `Root.ProcessHelp()`.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

core/commands/root.go

@@ -153,6 +153,7 @@ var rootROSubcommands = map[string]*cmds.Command{
 }
 
 func init() {
+	Root.ProcessHelp()
 	*RootRO = *Root
 
 	// sanitize readonly refs command