iOS: backspace + space deletes extra character

[robbertbrak]

To reproduce:

• With the latest version of Draft, open the rich text example in mobile Safari on iOS
• Type a character and use an autocomplete suggestion to finish the word. Note that the word and a space is inserted
• Press backspace. This removes the space after the word, as expected. The cursor is now directly at the end of the word.
• Press the spacebar. This should re-insert the space after the word.

Result: the last character of the word is replaced by a space.

[claudiopro]

Thanks for reporting this bug @robbertbrak!