### 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
shader->vstructs.push_back(st); 
#ifdef DEBUG_ENABLED
				if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_STRUCT_FLAG)) {
					used_structs.insert(st.name, Usage(tk_line));
				}
#endif 
			} break;
			case TK_GLOBAL: {
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNIFORM_KEYWORD;
				if (_lookup_next(next)) {
					if (next.type == TK_UNIFORM) {
						keyword_completion_context ^= CF_UNIFORM_KEYWORD;
					}
				}
#endif 
				tk = _get_token();
				if (tk.type != TK_UNIFORM) {
					_set_expected_after_error("uniform", "global");
					return ERR_PARSE_ERROR;
				}
				uniform_scope = ShaderNode::Uniform::SCOPE_GLOBAL;
			};
				[[fallthrough]];
			case TK_INSTANCE: {
				if (tk.type == TK_INSTANCE) {
#ifdef DEBUG_ENABLED
					keyword_completion_context = CF_UNIFORM_KEYWORD;
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {