Remove unnecessary hash merge in TargetFinder

The typo fail_level instead of fail_fast didn't affect function, so
that whole thing is unnecessary. Let values default to nil instead of
false. Works the same.
[Fix #1106] EachWithObject with method call body
Merge pull request #1108 from geniou/each_with_object_fix

[Fix #1106] EachWithObject with method call body
Merge pull request #1107 from jonas054/fix_fail_fast

Remove unnecessary hash merge in TargetFinder