command: hard wrap help message flags

This greatly improves readability when lots of flags are registered.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/hakurei/command_test.go

@@ -19,10 +19,9 @@ func TestHelp(t *testing.T) {
 		want string
 	}{
 		{
-			"main", []string{}, `
-Usage:	hakurei [-h | --help] [-v] [--insecure] [--json] COMMAND [OPTIONS]
+			"main", []string{}, `usage: hakurei [-h | --help] [-v] [--insecure] [--json] <command> [<args>]
 
-Commands:
+commands:
     run         Load and start container from configuration file
     exec        Configure and start a permissive container
     show        Show live or local instance configuration
@@ -35,10 +34,14 @@ Commands:
 `,
 		},
 		{
-			"exec", []string{"exec", "-h"}, `
-Usage:	hakurei exec [-h | --help] [--dbus-config <value>] [--dbus-system <value>] [--mpris] [--dbus-log] [--id <value>] [-a <int>] [-g <value>] [-d <value>] [-u <value>] [--policy <value>] [--priority <int>] [--private-runtime] [--private-tmpdir] [--wayland] [-X] [--dbus] [--pipewire] [--pulse] COMMAND [OPTIONS]
+			"exec", []string{"exec", "-h"}, `usage: hakurei exec [-h | --help] [--dbus-config <value>]
+                    [--dbus-system <value>] [--mpris] [--dbus-log]
+                    [--id <value>] [-a <int>] [-g <value>] [-d <value>]
+                    [-u <value>] [--policy <value>] [--priority <int>]
+                    [--private-runtime] [--private-tmpdir] [--wayland] [-X]
+                    [--dbus] [--pipewire] [--pulse] <command> [<args>]
 
-Flags:
+flags:
   -X	Enable direct connection to X11
   -a int
     	Application identity