test_auto_purge_with_pull_filtering[enabled] C-platform testserver app need to set log location properly

test_auto_purge_with_pull_filtering[enabled] fails with error:

FileNotFoundError: [Errno 2] No such file or directory: '/tmp/cbl-logs/log_1641339715230'

the actual log has been stored under '/tmp/log_1641339715230' and FileLoggingMethods.cpp has implementation of:
#ifdef _APPLE_
extern string LogTempDirectory();
#else
static string LogTempDirectory()

{ #ifdef _MSC_VER WCHAR pathBuffer[MAX_PATH + 1]; GetTempPathW(MAX_PATH, pathBuffer); GetLongPathNameW(pathBuffer, pathBuffer, MAX_PATH); CW2AEX<256> convertedPath(pathBuffer, CP_UTF8); return string(convertedPath.m_psz); #elif defined(__ANDROID__) return GlobalApp->activity->internalDataPath; #else *return "/tmp"*; #endif }

#endif

Need to fix the testserver C implementation to store logs in the designated location, or for C platform, change the log pulling location to meet the current implementation