ensure test_scroll_errors and test_sscursor_scroll_errors initialize their tables #694
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What do these changes do?
When changing the order of some tests, e.g. not running asyncio and uvloop tests next to each other, these missing prepares can currently lead to test failures.
This failed e.g. in #693.
I have not yet checked why this wouldn't always fail, as it seems that sometimes these tables are available, but this fixes the tests to only rely on data expected to be present.