Revert "shared: Match literal emoji in typeahead."

This reverts commit a8fd535955.
This reverts commit 944781e873.

In an attempt to introduce code from mobile into web to match literal
emojis, the author inadvertently introduced a buggy and smelly change.
Probably best to leave the implementation of this in mobile where there
is more context about the shape of the emoji object available. Web
doesn't actually benefit from the additional behavior anyway.

See https://github.com/zulip/zulip/pull/21723#pullrequestreview-937051603

frontend_tests/node_tests/typeahead.js

@@ -52,13 +52,6 @@ run_test("get_emoji_matcher", () => {
 
     assert_matches("japanese_post_", [emoji_japanese_post_office]);
     assert_matches("japanese post ", [emoji_japanese_post_office]);
-
-    assert_matches("🐼", [emoji_panda_face]);
-});
-
-run_test("parse_unicode_emoji_code", () => {
-    assert.equal(typeahead.parse_unicode_emoji_code("1f43c"), "🐼");
-    assert.equal(typeahead.parse_unicode_emoji_code("not_unicode"), undefined);
 });
 
 run_test("triage", () => {

static/shared/js/typeahead.js

@@ -98,30 +98,13 @@ export function clean_query_lowercase(query) {
     return query;
 }
 
-export const parse_unicode_emoji_code = (code) => {
-    try {
-        return code
-            .split("-")
-            .map((hex) => String.fromCodePoint(Number.parseInt(hex, 16)))
-            .join("");
-    } catch {
-        // Code could not be parsed, but instead of throwing an exception
-        // we return undefined instead of a string.
-        return undefined;
-    }
-};
-
 export function get_emoji_matcher(query) {
     // replaces spaces with underscores for emoji matching
     query = query.replace(/ /g, "_");
     query = clean_query_lowercase(query);
 
     return function (emoji) {
-        const matches_emoji_literal =
+        return query_matches_source_attrs(query, emoji, ["emoji_name"], "_");
-            emoji.emoji_code && parse_unicode_emoji_code(emoji.emoji_code) === query;
-        return (
-            matches_emoji_literal || query_matches_source_attrs(query, emoji, ["emoji_name"], "_")
-        );
     };
 }