[lldb] Fix missing comsumeError() with LLDB_LOG in ObjectFileCOFF/PECOFF (#70793)

All `llvm::Error`s must be checked/consumed before destruction. Previously,
the errors in this patch were only consumed when logging was enabled.
Using `LLDB_LOG_ERROR` instead of `LLDB_LOG` fixes that, because it
calls `llvm::consumeError()` explicitly when logging is disabled.