Changes: use number mode keyboard for Qt::ImhDigitsOnly
Changes: use number mode keyboard for Qt::ImhDigitsOnly

RevBy: TrustMe
Details: fixes NB#170191. Might have unnecessary sign or decimal
number chars, but much better than free text.

Full, original commit at 0b131352a822f65781c86e4d6d1ba3d7b8465541 in maliit-framework

maliit/inputcontext-qt4,maliit/inputcontext-qt4,perencia/inputcontext-qt4