TextInput & TextView: Klocwork issues fix

[Problem] Klocwork issues

Ideally text-input-decorator-impl.cpp should have the issues ignored as not a problem.
If that is not possible then remove them as of this patch and they will have to be replaced later.

[Cause] 1. unreachable code
        2. data members are not initialized in constructor
        3. constant condition in conditional expression
        4. unused assignment

[Solution]

Change-Id: I49d7bab8600d05299694ce4240ae440334cb65f5