Quick fix for attributes that overlap with other types

[elbrujohalcon]

Regular if and else (part of maybe) expressions already used those types.

Note

Devs may still generate trouble in Elvis if they do stuff like…

-'maybe'(something). %% or...
-'catch'(stuff).

But…

1. The parsing of those attributes is not affected by this code (i.e., they don't go through revert/2); therefore…
2. It was already possible to mess with Elvis before [Fix #87] Fix parse-reverting of -define attributes #88.