Bug 1053647 - delete space when reverting an autocorrection and don't insert space when user selects a word suggestion

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/accessibility/keyboard/test_a11y_keyboard_word_suggestions.py
	tests/python/gaia-ui-tests/gaiatest/tests/functional/keyboard/test_keyboard_predictive_key.py