### 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)

} else if (GETCHAR(0) == '-') {
					char_idx++;
					return _make_token(TK_OP_DECREMENT);
				}
				return _make_token(TK_OP_SUB);
			} break;
			case '%': {
				if (GETCHAR(0) == '=') {
					char_idx++;
					return _make_token(TK_OP_ASSIGN_MOD);
				}
				return _make_token(TK_OP_MOD);
			} break;
			case '@': {
				if (GETCHAR(0) == '@' && GETCHAR(1) == '>') {
					char_idx += 2;
					LocalVector<char32_t> incp;
					while (GETCHAR(0) != '\n') {
						incp.push_back(GETCHAR(0));
						char_idx++;
					}
					incp.push_back(0); 
					String include_path(incp.ptr());
					include_positions.write[include_positions.size() - 1].line = tk_line;
					FilePosition fp;
					fp.file = include_path;
					fp.line = 0;
					tk_line = 0;
					include_positions.push_back(fp);
				} else if (GETCHAR(0) == '@' && GETCHAR(1) == '<') {