multiply blend mode fix for spatial materials

drivers/gles3/rasterizer_scene_gles3.cpp

@@ -2085,9 +2085,9 @@ void RasterizerSceneGLES3::_render_list(RenderList::Element **p_elements, int p_
 						case RasterizerStorageGLES3::Shader::Spatial::BLEND_MODE_MUL: {
 							glBlendEquation(GL_FUNC_ADD);
 							if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
-								glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+								glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_DST_ALPHA, GL_ZERO);
 							} else {
-								glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+								glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_ZERO, GL_ONE);
 							}
 
 						} break;