### 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
return ERR_PARSE_ERROR;
						}
						Node *expr = _parse_and_reduce_expression(nullptr, constants);
						if (!expr) {
							return ERR_PARSE_ERROR;
						}
						if (expr->type != Node::TYPE_CONSTANT) {
							_set_error(RTR("Expected constant expression after '='."));
							return ERR_PARSE_ERROR;
						}
						ConstantNode *cn = static_cast<ConstantNode *>(expr);
						uniform.default_value.resize(cn->values.size());
						if (!convert_constant(cn, uniform.type, uniform.default_value.ptrw())) {
							_set_error(vformat(RTR("Can't convert constant to '%s'."), get_datatype_name(uniform.type)));
							return ERR_PARSE_ERROR;
						}
						tk = _get_token();
					}
					shader->uniforms[name] = uniform;
#ifdef DEBUG_ENABLED
					if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_UNIFORM_FLAG)) {
						used_uniforms.insert(name, Usage(tk_line));
					}
#endif 
					
					uniform_scope = ShaderNode::Uniform::SCOPE_LOCAL;
					if (tk.type != TK_SEMICOLON) {
						_set_expected_error(";");
						return ERR_PARSE_ERROR;
					}