Disable UTF8-escaping diacritics

[Avid Seeker <avidseeker7@xxxxxxxxxxxxxx>]

Currently, it is not possible to input Arabic Diacritics in a zsh prompt.

E.g: pasting this in zsh:

$ echo السَّلامُ

Results in

$ echo الس<0651><064e>لام<064f>

While this is often desirable when dealing with some Unicode characters,
especially when dealing with hidden characters like ZWNJ, it is not 
helpful when inputting Arabic text.

See: https://en.wikipedia.org/wiki/Arabic_diacritics for the Unicode entries
and more examples.