Removed duplicated conditional in GLES2

drivers/gles2/rasterizer_scene_gles2.cpp

@@ -1869,7 +1869,6 @@ void RasterizerSceneGLES2::_setup_light_type(LightInstance *p_light, ShadowAtlas
 	state.scene_shader.set_conditional(SceneShaderGLES2::LIGHT_USE_PSSM2, false);
 	state.scene_shader.set_conditional(SceneShaderGLES2::LIGHT_USE_PSSM4, false);
 	state.scene_shader.set_conditional(SceneShaderGLES2::LIGHT_USE_PSSM_BLEND, false);
-	state.scene_shader.set_conditional(SceneShaderGLES2::USE_SHADOW, false);
 
 	if (!p_light) { //no light, return off
 		return;