Also fix the addressing to correctly use the slice pitch to advance to the correct layer in an arrayed 1D texture, rather than using the row pitch.

Bug: b/130768731
Test: dEQP-VK.image.*
Change-Id: I46b8c4eb353d7901d5953df46138ff9e01f87ead
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29411Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>