Test fixes

First commit fixes the test file failing to compile (cannot assign `QPair<Table,bool>` to `Table`).

Second commit updates the test for commit 55678bb9450a0546835b2d86f5124e7efb0a1109

There is still one failing test:

    FAIL!  : TestTable::createTableWithNotLikeConstraint() 'tab.fields().at(0)->check() == "value NOT LIKE 'prefix%'"' returned FALSE. ()
    Loc: [/builddir/build/BUILD/sqlitebrowser-3.3.0/src/tests/testsqlobjects.cpp(244)]