InvalidStateError for IDB on FIrefox 60

[charlag]

We apply workaround for Safari below 12.1 and for Firefox below 60 but it seems like it doesn't work in 60

Stacktrace

Tutanota version: 3.38.6
Timestamp (UTC): Sun, 21 Oct 2018 09:50:22 GMT
User agent: 
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

> Stacktrace: 
> DbError. IDB could not get data os:GroupMetaData key:Ks3PSfg--g-0: InvalidStateError, An attempt was made to use an object that is not, or is no longer, usable> .execute/DbTransactionr@https://mail.tutanota.com/libs.js:32:9667
> [22].execute/DbTransaction.execute/IndexerCore.execute/IndexerCorer@https://mail.tutanota.com/libs.js:32:9667
> [22][22][22][22]c@https://mail.tutanota.com/libs.js:30:1555
> a@https://mail.tutanota.com/libs.js:30:1496
> [2]r/this.drainQueues@https://mail.tutanota.com/libs.js:30:1236
> 
> DbError@https://mail.tutanota.com/common.js:1:176592
> .execute/DbTransactionr@https://mail.tutanota.com/libs.js:32:9667
> [22].execute/DbTransaction.execute/IndexerCore.execute/IndexerCorer@https://mail.tutanota.com/libs.js:32:9667
> [22][22][22][22]c@https://mail.tutanota.com/libs.js:30:1555
> a@https://mail.tutanota.com/libs.js:30:1496
> [2]r/this.drainQueues@https://mail.tutanota.com/libs.js:30:1236

[charlag]

May not be an error with transaction but rather the same problem as #779 #452

[charlag]

Assume tested