### 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)

DataPrecision precision2 = PRECISION_DEFAULT;
								if (is_token_precision(tk.type)) {
									precision2 = get_token_precision(tk.type);
									tk = _get_token();
									if (!is_token_nonvoid_datatype(tk.type)) {
										_set_error(RTR("Expected data type after precision modifier."));
										return ERR_PARSE_ERROR;
									}
								}
								DataType type2;
								StringName struct_name2 = "";
								if (shader->structs.has(tk.text)) {
									type2 = TYPE_STRUCT;
									struct_name2 = tk.text;
								} else {
									if (!is_token_variable_datatype(tk.type)) {
										_set_error(RTR("Invalid data type for the array."));
										return ERR_PARSE_ERROR;
									}
									type2 = get_token_datatype(tk.type);
								}
								if (precision2 != PRECISION_DEFAULT && _validate_precision(type2, precision2) != OK) {
									return ERR_PARSE_ERROR;
								}
								int array_size2 = 0;
								tk = _get_token();
								if (tk.type == TK_BRACKET_OPEN) {
									bool is_unknown_size = false;
									Error error = _parse_array_size(p_block, p_function_info, false, nullptr, &array_size2, &is_unknown_size);
									if (error != OK) {