### 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
while (bnode) {
						if (bnode->variables.has(name)) {
							_set_error(RTR("Expected a function name."));
							return nullptr;
						}
						bnode = bnode->parent_block;
					}
					
					int function_index = -1;
					for (int i = 0; i < shader->functions.size(); i++) {
						if (shader->functions[i].name == name) {
							
							for (int j = 0; j < shader->functions.size(); j++) {
								if (shader->functions[j].name == current_function) {
									shader->functions.write[j].uses_function.insert(name);
									break;
								}
							}
							
							function_index = i;
							break;
						}
					}
					if (carg >= 0) {
						completion_type = COMPLETION_CALL_ARGUMENTS;
						completion_line = tk_line;
						completion_block = p_block;
						completion_function = funcname->name;
						completion_argument = carg;
					}