[trivial] Reuse translation and cleanup DEFAULT_* values

* DEFAULT_DISABLE_SAFEMODE = false
* Use DEFAULT_* constants for extern bools

src/util.cpp

@@ -110,9 +110,9 @@ bool fPrintToDebugLog = true;
 bool fDaemon = false;
 bool fServer = false;
 string strMiscWarning;
-bool fLogTimestamps = true;
+bool fLogTimestamps = DEFAULT_LOGTIMESTAMPS;
 bool fLogTimeMicros = DEFAULT_LOGTIMEMICROS;
-bool fLogIPs = false;
+bool fLogIPs = DEFAULT_LOGIPS;
 volatile bool fReopenDebugLog = false;
 CTranslationInterface translationInterface;