test: fix flaky test-force-repl-with-eval

[santigimeno]

Checklist

• make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

Remove the timer just in case the test takes longer to complete.

It has already failed on the smartos bot: https://ci.nodejs.org/job/node-test-commit-smartos/5075/nodes=smartos14-64/consoleFull

not ok 324 parallel/test-force-repl-with-eval
# /home/iojs/build/workspace/node-test-commit-smartos/nodes/smartos14-64/test/parallel/test-force-repl-with-eval.js:10
#   throw new Error('timeout!');
#   ^
# 
# Error: timeout!
#     at Timeout._onTimeout (/home/iojs/build/workspace/node-test-commit-smartos/nodes/smartos14-64/test/parallel/test-force-repl-with-eval.js:10:9)
#     at ontimeout (timers.js:365:14)
#     at tryOnTimeout (timers.js:237:5)
#     at Timer.listOnTimeout (timers.js:207:5)

[Trott]

LGTM