### 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 (p_node->type != Node::TYPE_OPERATOR) {
		return p_node;
	}
	
	OperatorNode *op = static_cast<OperatorNode *>(p_node);
	if (op->op == OP_CONSTRUCT) {
		ERR_FAIL_COND_V(op->arguments[0]->type != Node::TYPE_VARIABLE, p_node);
		DataType type = op->get_datatype();
		DataType base = get_scalar_type(type);
		int cardinality = get_cardinality(type);