[lld] [NFC][ELF] Remove redundant and unused file argument from deleteFallThruJmpInsn (PR #180540)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

No worries, I happened to noticed it when messing with getRelocTargetVA downstream that's on a version prior to 2b5cb1bf628fc54473355e0675f629d9332089df and figured I'd avoid other people getting confused like I did about why it was there :)

https://github.com/llvm/llvm-project/pull/180540