### 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)

#ifdef DEBUG_ENABLED
						if (keyword_completion_context & CF_CONST_KEYWORD) {
							keyword_completion_context ^= CF_CONST_KEYWORD;
						}
						if (keyword_completion_context & CF_FUNC_DECL_PARAM_SPEC) {
							keyword_completion_context ^= CF_FUNC_DECL_PARAM_SPEC;
						}
						if (_lookup_next(next)) {
							if (is_token_precision(next.type)) {
								keyword_completion_context = CF_FUNC_DECL_PARAM_TYPE;
							} else if (is_token_datatype(next.type)) {
								keyword_completion_context = CF_PRECISION_MODIFIER;
							}
						}
#endif 
						if (error) {
							return ERR_PARSE_ERROR;
						}
					}
					DataType param_type;
					StringName param_name;
					StringName param_struct_name;
					DataPrecision param_precision = PRECISION_DEFAULT;
					int arg_array_size = 0;
					if (is_token_precision(tk.type)) {
						param_precision = get_token_precision(tk.type);
						tk = _get_token();
#ifdef DEBUG_ENABLED
						if (keyword_completion_context & CF_CONST_KEYWORD) {
							keyword_completion_context ^= CF_CONST_KEYWORD;