### 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
}
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_UNSPECIFIED;
#endif 
			int array_size = 0;
			bool fixed_array_size = false;
			bool first = true;
			VariableDeclarationNode *vdnode = alloc_node<VariableDeclarationNode>();
			vdnode->precision = precision;
			if (is_struct) {
				vdnode->struct_name = struct_name;
				vdnode->datatype = TYPE_STRUCT;
			} else {
				vdnode->datatype = type;
			};
			vdnode->is_const = is_const;
			do {
				bool unknown_size = false;
				VariableDeclarationNode::Declaration decl;
				tk = _get_token();
				if (first) {
					first = false;
					if (tk.type != TK_IDENTIFIER && tk.type != TK_BRACKET_OPEN) {
						_set_error(RTR("Expected an identifier or '[' after type."));
						return ERR_PARSE_ERROR;
					}
					if (tk.type == TK_BRACKET_OPEN) {
						Error error = _parse_array_size(p_block, p_function_info, false, &decl.size_expression, &array_size, &unknown_size);
						if (error != OK) {
							return error;