[MC-117933] /clone command treats invalid optional arguments as if they were default

Any invalid value for [maskMode] in clone is treated as replace
Ex. command (a block below you is moved to be next to you)
```
/clone ~ ~-1 ~ ~ ~-1 ~ ~1 ~ ~ invalidValue move
```
Any invalid value for [cloneMode] in clone is treated as normal
Ex. command (the command will fail with "Source and destination can not overlap", even thought invalidValue is not normal)
```
/clone ~ ~ ~ ~1 ~ ~ ~ ~ ~ replace invalidValue
```

Expected behavior would be that is shows an error message that states that the argument is not valid

Linked issues

It do the same thing in 1.12-pre3

@unknown, 1.12-pre3 is outdated and can't be chosen as an affected version

Can confirm for 1.12.1.