[clang-tidy] Delete obsolete objc-property-declaration options ✂️

Summary:
The `Acronyms` and `IncludeDefaultAcronyms` options were deprecated in
https://reviews.llvm.org/D51832. These options can be removed.

Tested by running the clang-tidy tests.

Reviewers: benhamilton, aaron.ballman

Reviewed By: aaron.ballman

Subscribers: Eugene.Zelenko, xazax.hun, cfe-commits

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D56945

llvm-svn: 351921