API: Remove 1e3>1 test case from ApiBaseTest

API: Remove 1e3>1 test case from ApiBaseTest

Follows-up d3da5e08d35f, which broke PHP 7.1 and PHP 7.2 test jobs.

This isn't about logic in ApiBase, but about PHP's str-to-int
logic which actually varies between PHP5 and PHP7.

One maps it to 1000, the other as strict int 1 (with non-numerical
text chopped off, the same as it would for 1foo).

If we want to support 1e3 as part of the API itself, then we'd
need to parse it ourselves and then add the test back.

Bug: T192425
Change-Id: I6fc43f29425749a1abe785fefa312db6a98ea7cd