src: remove unnecessary else in base_object-inl.h

This commit removes two unnecessary else statements in
base_object-inl.h. It also tries to make the if statements consistent
with regards to braces.

PR-URL: https://github.com/nodejs/node/pull/33413


Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>