Fix uniform1iv when using javascript arrays

The uniform1iv function called internally uniform1fva when the
data was supplied in a javascript array rather than a typed array.

Change-Id: I0b2ea3495f7f9dcd8beefc7c4120e3ff8ffef6ba
Task-number: QTBUG-46166
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>