* fcl-db: tests: fix negative integer filter test from r25754; add subtest with integer constants



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25782 3ad0048d-3df7-0310-abae-a5850022a9f2
* fcl-db: dbase/bufdataset expression parser: allow negative integers/large integers/floats; fixes issue #25168



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25783 3ad0048d-3df7-0310-abae-a5850022a9f2