### 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)

out_args.insert(arg);
						}
						break;
					}
					idx2++;
				}
				if (completion_function == builtin_func_defs[idx].name) {
					if (builtin_func_defs[idx].tag != completion_class) {
						idx++;
						continue;
					}
					if (calltip.length()) {
						calltip += "\n";
					}
					calltip += get_datatype_name(builtin_func_defs[idx].rettype);
					calltip += " ";
					calltip += builtin_func_defs[idx].name;
					calltip += "(";
					bool found_arg = false;
					for (int i = 0; i < BuiltinFuncDef::MAX_ARGS - 1; i++) {
						if (builtin_func_defs[idx].args[i] == TYPE_VOID) {
							break;
						}
						if (i > 0) {
							calltip += ", ";
						} else {
							calltip += " ";
						}
						if (i == completion_argument) {
							calltip += char32_t(0xFFFF);