Bug: The counts for the number of townsfolk, outsiders, minions, demons does not update when a script is updated

**Describe the bug**
Noticed when fixing https://github.com/AdmiralGT/botc-scripts/pull/342, the error was hit here reading the JSON of the script, but it wasn't being hit on script updates. Turns out that's because we update the script without trying to parse the numbers.

Looks like we'll need to run a database update to update all scripts (also Ojo was initially miscategorised as a Minion) since loads have the wrong numbers :(