test: fix OPT_STEP_ADAMW for test-backend-ops #974
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Fixup for #966 .
When I tested
GGML_OP_OPT_STEP_ADAMWI had mistyped the filter fortest-backend-opsso I didn't notice that the test is broken. The problem is that the gradients for tensors are no longer being allocated unless a backward graph is constructed. This can simply be fixed by explicitly creating a tensor the gradients. Also I'm changing the interface forggml_opt_step_adamwto accept a gradient tensor since the long term goal forggml_tensor.gradis to remove it.