Remove backslash from search queries

Co-authored-by: Lee Randy <randy.lee@metronom.com>
Co-authored-by: Evan Hahn <69474926+EvanHahn-Signal@users.noreply.github.com>

See [#5053][0].

[0]: https://github.com/signalapp/Signal-Desktop/pull/5053

ts/util/cleanSearchTerm.ts

@@ -4,7 +4,7 @@
 export function cleanSearchTerm(searchTerm: string): string {
   const lowercase = searchTerm.toLowerCase();
   const withoutSpecialCharacters = lowercase.replace(
-    /([!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~])/g,
+    /([-!"#$%&'()*+,./\\:;<=>?@[\]^_`{|}~])/g,
     ' '
   );
   const whiteSpaceNormalized = withoutSpecialCharacters.replace(/\s+/g, ' ');