### 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)

fail = true;
							break;
						}
					}
					if (get_scalar_type(args[i]) == args[i] && p_func->arguments[i + 1]->type == Node::TYPE_CONSTANT && convert_constant(static_cast<ConstantNode *>(p_func->arguments[i + 1]), builtin_func_defs[idx].args[i])) {
						
					} else if (args[i] != builtin_func_defs[idx].args[i]) {
						fail = true;
						break;
					}
				}
				if (!fail) {
					if (RenderingServer::get_singleton()->is_low_end()) {
						if (builtin_func_defs[idx].high_end) {
							fail = true;
							unsupported_builtin = true;
							builtin_idx = idx;
						}
					}
				}
				if (!fail && argcount < 4 && builtin_func_defs[idx].args[argcount] != TYPE_VOID) {
					fail = true; 
				}
				if (!fail) {
					{
						int constarg_idx = 0;
						while (builtin_func_const_args[constarg_idx].name) {
							if (String(name) == builtin_func_const_args[constarg_idx].name) {
								int arg = builtin_func_const_args[constarg_idx].arg + 1;
								if (p_func->arguments.size() <= arg) {