message: [contour] Try GLSL 3.00 for ES
diff: @@ -887,7 +887,7 @@ std::optional<ShaderConfig> Config::loadShaderConfig(ShaderClass _shaderClass)
  auto const prependVersionPragma = [&](string const& _code) {
  if (QOpenGLContext::currentContext()->isOpenGLES())
  - return "#version 320 es\n#line 1\n" + _code;
  + return "#version 300 es\n#line 1\n" + _code;
  else
  return "#version 330\n#line 1\n" + _code;
  };
  