Fixed WHILE-MEASURING macro for case when CATCH-ERRORS-P argument is given

Fixed WHILE-MEASURING macro for case when CATCH-ERRORS-P argument is given

Previously it didn't catched error and other outer handler was able to catch it.
For example in this situation WHILE-MEASURING will not return it's measurments:

    CL-USER> (ignore-errors
               (lift:while-measuring (t :measure-seconds)
                  (sleep 5)
                  (error "Some shit happened")))
    NIL
    #<SIMPLE-ERROR 70B0125B13>

but I'd expect it to return:

    NIL
    (5.007D0)
    #<SIMPLE-ERROR 70B0004B73>

This commit fixes the problem.