### 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
flow->flow_op = FLOW_OP_CONTINUE;
			pos = _get_tkpos();
			tk = _get_token();
			if (tk.type != TK_SEMICOLON) {
				
				_set_expected_after_error(";", "continue");
				return ERR_PARSE_ERROR;
			}
			p_block->statements.push_back(flow);
		} else {
			
			_set_tkpos(pos); 
			Node *expr = _parse_and_reduce_expression(p_block, p_function_info);
			if (!expr) {
				return ERR_PARSE_ERROR;
			}
			is_condition = expr->type == Node::TYPE_OPERATOR && expr->get_datatype() == TYPE_BOOL;
			if (expr->type == Node::TYPE_OPERATOR) {
				OperatorNode *op = static_cast<OperatorNode *>(expr);
				if (op->op == OP_EMPTY) {
					is_var_init = true;
					is_condition = true;
				}
			}
			p_block->statements.push_back(expr);
			tk = _get_token();
			if (p_block->block_type == BlockNode::BLOCK_TYPE_FOR_CONDITION) {
				if (tk.type == TK_COMMA) {
					if (!is_condition) {
						_set_error(RTR("The middle expression is expected to be a boolean operator."));