STYLE: TScalarType -> TScalar

According to ITK Style Guidelines, for type XX, TXX is used in the template
declaration, and "typedef TXX XXType;" is used within the class to refer to
the type.

Change-Id: I319855e2ccbec2429368a0f9663128f64e48332a
Merge topic 'TScalarType'

0946f35 STYLE: TScalarType -> TScalar