[FIX] web: MockServer: don't alter domain in place
[FIX] web: MockServer: don't alter domain in place

In a test, we might want to check the domains given to RPCs with
assert.step/verifySteps. Before this rev., if there were an
'active' field on the model, ['active', '=', true] was
automatically added to the domain by the MockServer in place, thus
altering the expected domain in the test.

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