Do not read epg.dat when imported from fallback tuner

As when this is done immediatelly it can interfere with getting the epg.dat from the fallback tuner.
Read discussion here https://forums.openpli.org/topic/62015-fallbacktuner-import-services-epg/page-2

lib/dvb/epgcache.cpp

@@ -382,6 +382,8 @@ eEPGCache::eEPGCache()
 {
 	eDebug("[eEPGCache] Initialized EPGCache (wait for setCacheFile call now)");
 
+	load_epg = eConfigManager::getConfigValue("config.usage.remote_fallback_import").find("epg") == std::string::npos;
+
 	enabledSources = 0;
 	historySeconds = 0;
 
@@ -1282,7 +1284,7 @@ void eEPGCache::thread()
 {
 	hasStarted();
 	nice(4);
-	load();
+	if (load_epg) { load(); }
 	cleanLoop();
 	runLoop();
 	save();

lib/dvb/epgcache.h

@@ -285,6 +285,7 @@ class eEPGCache: public eMainloop, private eThread, public sigc::trackable
 	updateMap channelLastUpdated;
 	std::string m_filename;
 	bool m_running;
+	bool load_epg;
 
 #ifdef ENABLE_PRIVATE_EPG
 	contentMaps content_time_tables;