SettingsDB: fix file descriptor leaks.

app/src/main/java/com/etesync/syncadapter/App.kt

@@ -210,6 +210,8 @@ class App : Application() {
             val dbHelper = ServiceDB.OpenHelper(this)
 
             migrateServices(dbHelper)
+
+            dbHelper.close()
         }
     }
 

app/src/main/java/com/etesync/syncadapter/HttpClient.kt

@@ -107,6 +107,8 @@ class HttpClient private constructor(
                 //if (BuildConfig.customCerts)
                     customCertManager(CustomCertManager(context, true,
                             !(settings.getBoolean(App.DISTRUST_SYSTEM_CERTIFICATES,false)), true))
+
+                dbHelper.close()
             }
 
             // use account settings for authentication