### 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
int array_size = 0;
				if (tk.type == TK_CONST) {
					is_constant = true;
					tk = _get_token();
				}
				if (is_token_precision(tk.type)) {
					precision = get_token_precision(tk.type);
					tk = _get_token();
				}
				if (shader->structs.has(tk.text)) {
					is_struct = true;
					struct_name = tk.text;
				} else {
#ifdef DEBUG_ENABLED
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {
							keyword_completion_context = CF_UNIFORM_QUALIFIER;
						}
					}
#endif 
					if (!is_token_datatype(tk.type)) {
						_set_error(RTR("Expected constant, function, uniform or varying."));
						return ERR_PARSE_ERROR;
					}
					if (!is_token_variable_datatype(tk.type)) {
						if (is_constant) {
							_set_error(RTR("Invalid constant type (samplers are not allowed)."));
						} else {
							_set_error(RTR("Invalid function type (samplers are not allowed)."));
						}