HTML5 export: GLES2: Tiled textures doesn't work for TextureRect and TextureButton, just black rectangle

Created by: etalot

Godot version: 3.1 master(downloaded yesterday) GLES2

OS/device including version: HTML5 GLES2 only

Issue description: HTML5 export: GLES2: Tiled textures doesn't work for TextureRect and TextureButton, just black rectangle

Must be:

Steps to reproduce: Just add to scene TextureRect and TextureButton, assign texture, set Expand true, and set Stratch Mode: Tile, export to HTML5 or use "Minimal reproduction project"

Minimal reproduction project: Empty.zip