subsys: dfu: boot: Remove unused ver query code.

Duplicate code to query was mistakenly added in commit
2ad7ccdb2de8c1ccf3ba94a2eb05b3a679f0cad5.  This code is redundant; the
existing `boot_read_bank_header()` function can read the version from
both image banks.

Signed-off-by: Christopher Collins <ccollins@apache.org>
2 files changed