MB-19929: Remove a wrong, redundant "ep_cursors_dropped" check
MB-19929: Remove a wrong, redundant "ep_cursors_dropped" check

Sporadic failure seen:
Running [0031/0083]: test dcp cursor dropping (couchstore)...(1 sec)
/home/couchbase/jenkins/workspace/ep-engine-addresssanitizer-master/
ep-engine/tests/ep_testsuite_dcp.cc:2410 Test failed:
`' (Expected `1', got `2' - Expected number of cursors not dropped)

This check is incorrect (should check greater than equal to rather)
and also not needed because we do that check few lines above.

Change-Id: I4763fff76e51839812d10edb30cf080c78c2ef6c
Reviewed-on: http://review.couchbase.org/71866
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,couchbase/ep-engine,couchbase/ep-engine,couchbase/ep-engine,membase/ep-engine,daverigby/ep-engine,daverigby/kv_engine,membase/ep-engine,daverigby/ep-engine,daverigby/ep-engine,membase/ep-engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/ep-engine,membase/ep-engine,couchbase/ep-engine