Rellocate test for T7689 to different directory

This test is testing primops, so it should be in the primops/
directory and not numeric.

testsuite/tests/numeric/should_run/all.T

@@ -60,5 +60,3 @@ test('T7014',
      ['$MAKE -s --no-print-directory T7014'])
 
 test('T7233', normal, compile_and_run, [''])
-
-test('T7689', normal, compile_and_run, [''])

testsuite/tests/primops/should_run/all.T

 test('T6135', normal, compile_and_run, [''])
+
+test('T7689', normal, compile_and_run, [''])