[DeadCode] Move SimplifyBoolIdenticalTrueRector and UnwrapSprintfOneArgumentRector to dead-code set

[TomasVotruba]

Both rules remove dead code rather than improve quality, so they fit the dead-code set better.

SimplifyBoolIdenticalTrueRector - dead comparison against a bool:

-$match = in_array($value, $items, true) === true;
+$match = in_array($value, $items, true);

UnwrapSprintfOneArgumentRector - dead sprintf() call with nothing to format:

-$value = sprintf('Hi');
+$value = 'Hi';

Namespaces stay as-is; only the set registration moves from CodeQualityLevel to DeadCodeLevel. Precedent: SimplifyUselessVariableRector already lives in DeadCodeLevel with its Rector\CodeQuality namespace.