SI-7602 Avoid crash in LUBs with erroneous code

If a class contains a double defintion of a method that overrides
an interface method, LUBs could run into a spot where filtering
overloaded alternatives to those that match the interface method
fails to resolve to a single overload, which crashes the compiler.

This commit uses `filter` rather than `suchThat` to avoid the crash.
Merge pull request #4097 from retronym/ticket/7602

SI-7602 Avoid crash in LUBs with erroneous code