Don't run in background

(cherry picked from commit f41a1e24b1b5d264e5ed17c463e96fce1b49c139)

FreeAPS/Sources/APS/APSManager.swift

@@ -247,8 +247,8 @@ final class BaseAPSManager: APSManager, Injectable {
 
         loopStats(loopStatRecord: loopStatRecord)
 
-        // Create a statistics.json
-        if settings.displayStatistics {
+        // Create a statistics.json. Don't run in backgound
+        if settings.displayStatistics, UIApplication.shared.applicationState != .background {
             statistics()
         }