Clarify some code and fix a bug (A41)

The test against hasMainDictionary is a test to know if we should
auto-correct or not. Its result should be recorded in
hasAutoCorrection, not in allowsToBeAutoCorrected.

Actually, this value being inserted in allowsToBeAutoCorrected was
causing a bug that nobody noticed: when typing in a language with
no dictionary, the word in the middle of the suggestion strip would
always be bold, as if it was going to auto-correct to itself !
This change fixes this bug.

Change-Id: Ia1f08efd7089b9c5cbede910c5b0951d83e698d2