Format: normalize spacing in imiv sources

Whitespace-only cleanup in src/imiv/imiv_test_engine.cpp and src/imiv/imiv_viewer.cpp: insert consistent blank lines between functions and blocks, simplify some aligned variable declarations, and fix minor spacing in an assignment. No logic or behavior changes.

Signed-off-by: Vlad (Kuzmin) Erium <libalias@gmail.com>
Signed-off-by: Vlad <shaamaan@gmail.com>

Author: ssh4net