Force buffers to be unscaled

Satellite will now force Xwayland to always render with the native
display resolution, and just scale surface sizes accordingly. As a result,
applications won't really respect DPI, but this can be adjusted through
the same means as with normal X11.

Part of #28.

src/lib.rs

@@ -67,6 +67,7 @@ pub fn main(data: impl RunData) -> Option<()> {
     let mut xwayland = xwayland
         .args([
             "-rootless",
+            "-force-xrandr-emulation",
             "-wm",
             &xsock_xwl.as_raw_fd().to_string(),
             "-displayfd",