### 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)

_set_error(RTR("Void value not allowed in expression."));
			return nullptr;
		} else if (is_token_nonvoid_datatype(tk.type) || tk.type == TK_CURLY_BRACKET_OPEN) {
			if (tk.type == TK_CURLY_BRACKET_OPEN) {
				
				_set_tkpos(prepos);
				expr = _parse_array_constructor(p_block, p_function_info);
			} else {
				DataType datatype;
				DataPrecision precision = PRECISION_DEFAULT;
				if (is_token_precision(tk.type)) {
					precision = get_token_precision(tk.type);
					tk = _get_token();
				}
				datatype = get_token_datatype(tk.type);
				if (precision != PRECISION_DEFAULT && _validate_precision(datatype, precision) != OK) {
					return nullptr;
				}
				tk = _get_token();
				if (tk.type == TK_BRACKET_OPEN) {
					
					_set_tkpos(prepos);
					expr = _parse_array_constructor(p_block, p_function_info);
				} else {
					if (tk.type != TK_PARENTHESIS_OPEN) {
						_set_error(RTR("Expected '(' after the type name."));
						return nullptr;
					}