Remove unnecessary code

Not needs set GL_DEPTH_TEST, Because when rendering to a framebuffer
that has no depth buffer, depth testing always behaves as though
the test is disabled, The initial value for each capability with
the exception of GL_DITHER is GL_FALSE.

render/gles2/pass.c

@@ -278,7 +278,6 @@ struct wlr_gles2_render_pass *begin_gles2_buffer_pass(struct wlr_gles2_buffer *b
 	glViewport(0, 0, wlr_buffer->width, wlr_buffer->height);
 	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 	glDisable(GL_SCISSOR_TEST);
-	glDisable(GL_DEPTH_TEST);
 	pop_gles2_debug(renderer);
 
 	return pass;