[rubygems/rubygems] Remove unnecessary early return

These are never equal.

rubygems/rubygems@69e369da74

Author: deivid-rodriguez

lib/bundler/source/git.rb

@@ -219,7 +219,6 @@ def install(spec, options = {})
       def cache(spec, custom_path = nil)
         app_cache_path = app_cache_path(custom_path)
         return unless Bundler.feature_flag.cache_all?
-        return if install_path == app_cache_path
         return if cache_path == app_cache_path
         cached!
         FileUtils.rm_rf(app_cache_path)