Properly reset blend mode when resetting canvas in compatibility renderer

drivers/gles3/rasterizer_canvas_gles3.cpp

@@ -2259,6 +2259,7 @@ void RasterizerCanvasGLES3::reset_canvas() {
 	glDisable(GL_DEPTH_TEST);
 	glDisable(GL_SCISSOR_TEST);
 	glEnable(GL_BLEND);
+	glBlendEquation(GL_FUNC_ADD);
 	glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
 
 	glActiveTexture(GL_TEXTURE0 + GLES3::Config::get_singleton()->max_texture_image_units - 2);