Remove trailing whitespace in dexdump golden output.

To make 137-dexmerger-dex38 pass after https://r.android.com/2000711.

Test: m dexdump-host
      dalvik/dx/tests/run-test 137-dexmerger-dex38
Bug: 221424738
Change-Id: Ie1f8d691e6bdb71437e2c1643e2fb1995e652d56