README.tpm: reflect that vendor_db is in fact logged as "vendor_db" #1022

Job	Run time
f41 x64 build compile_commands.json	3m 8s
f41 x64 build	2m 28s
f41 aa64 cross-build	2m 14s
f40 x64 build	2m 10s
f40 aa64 cross-build	1m 56s
f39 x64 build	2m 10s
f41 arm cross-build	2m 13s
centos9 x64 build	1m 13s
f40 arm cross-build	2m 18s
centos8 x64 build	1m 15s
f39 arm cross-build	1m 58s
f39 ia32 build	2m 8s
centos8 ia32 build	1m 18s
f41 x64 cross-build	2m 13s
f40 x64 cross-build	2m 14s
f39 x64 cross-build	2m 5s
f41 ia32 cross-build	2m 17s
f40 ia32 cross-build	2m 5s
f39 ia32 cross-build	2m 9s
	39m 32s

Provide feedback