### 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)

if (include_positions.size() == 1) {
						return _make_token(TK_ERROR, "Invalid include exit hint @@< without matching enter hint.");
					}
					char_idx += 2;
					include_positions.resize(include_positions.size() - 1); 
					tk_line = include_positions[include_positions.size() - 1].line - 1; 
				} else {
					return _make_token(TK_ERROR, "Invalid include enter/exit hint token (@@> and @@<)");
				}
			} break;
			default: {
				char_idx--; 
				if (is_digit(GETCHAR(0)) || (GETCHAR(0) == '.' && is_digit(GETCHAR(1)))) {
					
					bool hexa_found = false;
					bool period_found = false;
					bool exponent_found = false;
					bool float_suffix_found = false;
					bool uint_suffix_found = false;
					bool end_suffix_found = false;
					enum {
						CASE_ALL,
						CASE_HEXA_PERIOD,
						CASE_EXPONENT,
						CASE_SIGN_AFTER_EXPONENT,
						CASE_NONE,
						CASE_MAX,
					} lut_case = CASE_ALL;
					static bool suffix_lut[CASE_MAX][127];
					if (!is_const_suffix_lut_initialized) {