### Godot version

4.0.beta16

### System information

Windows 10 Pro x64, GLES3, RTX 3080 Ti (528.02)

### Issue description

In Compatibility/GLES3 back-end, shaders which use a uniform to get the normal roughness buffer cannot compile. For example, the shader:
```glsl
shader_type spatial;

uniform sampler2D normal_roughness_texture : hint_normal_roughness_texture;

void fragment() {
    vec4 sample = texture(normal_roughness_texture, UV);
}
```
results in an error in the output:
```
  drivers/gles3/shader_gles3.cpp:242 - SceneShaderGLES3: Fragment shader compilation failed:
  0(890) : error C1503: undefined variable "normal_roughness_buffer"
  
  drivers/gles3/shader_gles3.cpp:342 - Method/function failed.
```

If I switch over to the Mobile or Forward+ backends, there is no shader compilation error.

### Steps to reproduce

Open the attached reproduction in the 4.0.beta16 editor.

When the scene is opened, the error is produced automatically:
1. Open `scene.tscn`
2. Open Output to review error

When the scene is saved with any changes made to the shader, the same error is also produced:
1. Open `scene.tscn`
2. Open `example.gdshader` in the shader editor.
3. Make a compile-able change to the shader.
4. Save the scene
5. Open Output to review the error

### Minimal reproduction project

[NormalRoughnessTexture_GLES3_Error.zip](https://github.com/godotengine/godot/files/10534253/NormalRoughnessTexture_GLES3_Error.zip)

}
						if (out_args.has(i)) {
							calltip += "out ";
						}
						calltip += get_datatype_name(builtin_func_defs[idx].args[i]);
						String arg_name = (String)builtin_func_defs[idx].args_names[i];
						if (!arg_name.is_empty()) {
							calltip += " ";
							calltip += arg_name;
						}
						if (i == completion_argument) {
							calltip += char32_t(0xFFFF);
						}
						found_arg = true;
					}
					if (found_arg) {
						calltip += " ";
					}
					calltip += ")";
				}
				idx++;
			}
			r_call_hint = calltip;
			return OK;
		} break;
		case COMPLETION_INDEX: {
			const char colv[4] = { 'r', 'g', 'b', 'a' };
			const char coordv[4] = { 'x', 'y', 'z', 'w' };
			const char coordt[4] = { 's', 't', 'p', 'q' };
			int limit = 0;