FvwmPrompt: don't lowercase all commands

Certain commands sent to Fvwm3 need the case to be intact as commands
such as modules look for files on disk (i.e. FvwmButtons vs
fvwmbuttons).

Leave the case alone.

bin/FvwmPrompt/FvwmPrompt.go

@@ -124,7 +124,7 @@ func main() {
 
 	shell := ishell.New()
 	shell.ShowPrompt(false)
-	shell.IgnoreCase(true)
+	shell.IgnoreCase(false)
 
 	shell.DeleteCmd("help")
 	shell.DeleteCmd("clear")