### 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)

ERR_FAIL_V(nullptr); 
			}
#ifdef DEBUG_ENABLED
			if (check_warnings && HAS_WARNING(ShaderWarning::FLOAT_COMPARISON_FLAG) && (op == OP_EQUAL || op == OP_NOT_EQUAL) &&
					(!expression[i - 1].is_op && !expression[i + 1].is_op) &&
					(expression[i - 1].node->get_datatype() == TYPE_FLOAT && expression[i + 1].node->get_datatype() == TYPE_FLOAT)) {
				_add_line_warning(ShaderWarning::FLOAT_COMPARISON);
			}
#endif 
			if (priority < min_priority) {
				
				
				next_op = i;
				min_priority = priority;
				is_unary = unary;
				is_ternary = ternary;
			}
		}
		ERR_FAIL_COND_V(next_op == -1, nullptr);
		
		if (is_unary) {
			int expr_pos = next_op;
			while (expression[expr_pos].is_op) {
				expr_pos++;
				if (expr_pos == expression.size()) {
					
					_set_error(RTR("Unexpected end of expression."));
					return nullptr;
				}
			}