event fix for file corruption

mission/tmtc/PersistentTmStore.cpp

@@ -320,6 +320,7 @@ ReturnValue_t PersistentTmStore::loadNextDumpFile() {
     }
     // File will change, reset this field for correct state-keeping.
     dumpParams.currentSameFileIdx = std::nullopt;
+    dumpParams.currentFileUnixStamp = dumpParams.dumpIter->epoch;
     // Increment iterator for next cycle.
     dumpParams.dumpIter++;
   };