#757 ZWNJ not included in hastags

In Persian language, using ZWNJ character is very common. You may find it (not see it) in نرم‌افزار between نرم and افزار. But on Plume, this character is included in hashtages. as the result, hashtags would look like this:  You may check the [article](https://fediverse.blog/~/%D8%A2%D8%B2%D8%A7%D8%AF/%D8%AF%D8%B1-%D8%A8%D8%A7%D8%A8-%D9%88%D9%84%DB%8C-%DA%AF%D9%88%DA%AF%D9%84-%D8%AC%D8%A7%D8%B3%D9%88%D8%B3%DB%8C-%D9%85%DB%8C%E2%80%8C%DA%A9%D9%86%D9%87) and see yourself. <!-- Please fill the following information when relevant (or remove them if not) --> - **Plume version:** 0.4.0 (on fediverse.blog) - **Operating system:** Gnu/Linux (Kubuntu 19.10) - **Web Browser:** Firefox 75.0