### 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
DataType data_type;
				if (tk.type == TK_IDENTIFIER) {
					bool is_const;
					_find_identifier(p_block, false, p_function_info, tk.text, &data_type, nullptr, &is_const);
					if (is_const) {
						if (data_type == TYPE_INT) {
							correct_constant_expression = true;
						}
					}
				}
				if (!correct_constant_expression) {
					_set_error(RTR("Expected an integer constant."));
					return ERR_PARSE_ERROR;
				}
				VariableNode *vn = alloc_node<VariableNode>();
				vn->name = tk.text;
				n = vn;
			} else {
				ConstantNode::Value v;
				if (tk.type == TK_UINT_CONSTANT) {
					v.uint = (uint32_t)tk.constant;
				} else {
					v.sint = (int)tk.constant * sign;
				}
				ConstantNode *cn = alloc_node<ConstantNode>();
				cn->values.push_back(v);
				cn->datatype = (tk.type == TK_UINT_CONSTANT ? TYPE_UINT : TYPE_INT);
				n = cn;
			}
			tk = _get_token();