Fix Ruby 2.5 compatibility for diverging counts of branches
!31480 does not fully restore compatibility because another Ruby 2.6 feature besides `Enumerable#filter` was used in commit ca5cd7b7. The use of `Enumerable#to_h`'s block is now replaced by an explicit `Enumerable#map` call. Error message: TypeError (wrong element type Gitlab::Git::Branch at 0 (expected array)): app/controllers/projects/branches_controller.rb:53:in `to_h' See https://bugs.ruby-lang.org/issues/15143. Fixes #64143.
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