### Godot version

4.0.beta14

### System information

windows 10, gles 3, nvidia graphics

### Issue description

SCREEN_TEXTURE  was dropped in beta 14. The suggested replacement is to use ```uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmaps;```, but filter_linear_mipmaps is not recognized as a valid shader type hint and a shader using it fails to compile.

### Steps to reproduce

Create a canvas item shader and use the filter_linear_mipmaps type hint with a sampler2D uniform.

### Minimal reproduction project

N/A
if (r_type) {
			*r_type = IDENTIFIER_VARYING;
		}
		return true;
	}
	if (shader->uniforms.has(p_identifier)) {
		if (r_data_type) {
			*r_data_type = shader->uniforms[p_identifier].type;
		}
		if (r_array_size) {
			*r_array_size = shader->uniforms[p_identifier].array_size;
		}
		if (r_type) {
			*r_type = IDENTIFIER_UNIFORM;
		}
		return true;
	}
	if (shader->constants.has(p_identifier)) {
		if (r_is_const) {
			*r_is_const = true;
		}
		if (r_data_type) {
			*r_data_type = shader->constants[p_identifier].type;
		}
		if (r_array_size) {
			*r_array_size = shader->constants[p_identifier].array_size;
		}
		if (r_struct_name) {
			*r_struct_name = shader->constants[p_identifier].type_str;
		}