Fixed indentation and style to match VTK's.

Change-Id: I802ecea9fe11c8c007a996915ce046734d5da4fb
BUG: Filter was overwriting input scalars. Fixed.

Change-Id: Iabef36000361c3c56b8778952d73df549c42dde9
Merge topic 'temporal-pathline-fix' into master

61688923 BUG: Filter was overwriting input scalars. Fixed.
b0a9b57c Fixed indentation and style to match VTK's.