Don't always delete active recordings from previously recorded.

When deleting a series from the previously recorded screen, don't
delete entries for programs that are currently recording.  This allows
them to be restarted if the backend dies unexpectedly.  Deleting
single entries is still allowed on the premise the user knows what
they are doing.

mythtv/programs/mythfrontend/prevreclist.cpp

@@ -777,8 +777,17 @@ void PrevRecordedList::DeleteOldSeries(bool ok)
 
     MSqlQuery query(MSqlQuery::InitCon());
     query.prepare("DELETE FROM oldrecorded "
-                  "WHERE title = :TITLE AND future = 0");
+                  "WHERE title = :TITLE "
+                  "      AND recstatus <> :PENDING "
+                  "      AND recstatus <> :TUNING "
+                  "      AND recstatus <> :RECORDING "
+                  "      AND recstatus <> :FAILING "
+                  "      AND future = 0");
     query.bindValue(":TITLE", title);
+    query.bindValue(":PENDING", RecStatus::Pending);
+    query.bindValue(":TUNING", RecStatus::Tuning);
+    query.bindValue(":RECORDING", RecStatus::Recording);
+    query.bindValue(":FAILING", RecStatus::Failing);
     if (!query.exec())
         MythDB::DBError("ProgLister::DeleteOldSeries -- delete", query);
 
@@ -793,7 +802,11 @@ void PrevRecordedList::DeleteOldSeries(bool ok)
     auto it = m_showData.begin();
     while (pos < (int)m_showData.size())
     {
-        if ((*it)->GetTitle() == title)
+        if ((*it)->GetTitle() == title
+            && (*it)->GetRecordingStatus() != RecStatus::Pending
+            && (*it)->GetRecordingStatus() != RecStatus::Tuning
+            && (*it)->GetRecordingStatus() != RecStatus::Recording
+            && (*it)->GetRecordingStatus() != RecStatus::Failing)
         {
             LOG(VB_GENERAL, LOG_INFO, QString("Deleting %1 at pos %2")
                 .arg(title).arg(pos));