x11: fix x360 wireless gamepad mapping.
x11: fix x360 wireless gamepad mapping.

Uses hat values instead of buttons for the dpad now.
Fixes #6419

(cherry picked from commit 20bad652efdb1a26ab3307aa733208b449e40c83)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1