ossfuzz: Remove max_len=100 option

The max_len field, which stipulates the maximum length of
 fuzzed input to feed a fuzzer target, was set to 100 for
the ovn expr_parse_target.

In discussions with Ben, this was deemed too restrictive.
Google folks also suggested the removal of this option
since it cannot be uniformly passed on to all fuzzer
engines behind oss-fuzz.

For the future, the suggested way to limit the length of
 fuzzed input is in the C code of the test harness itself.

Signed-off-by: Bhargava Shastry <bshastry@sect.tu-berlin.de>
Signed-off-by: Ben Pfaff <blp@ovn.org>

tests/oss-fuzz/config/expr_parse_target.options

@@ -1,4 +1,3 @@
 [libfuzzer]
 dict = expr.dict
 close_fd_mask = 3
-max_len = 100