{NativeModuleDeserializer::ReadCode} always returned {true}. Thus remove
this return value and the code handling a {false} return.

R=thibaudm@chromium.org

Bug: chromium:1110258

Change-Id: I2cf76936f6eea213e6318ea35bdb58b2ded801c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2352782Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69449}