[SPARKR] found some extra whitespace in the R tests
## What changes were proposed in this pull request? during my ubuntu-port testing, i found some extra whitespace that for some reason wasn't getting caught on the centos lint-r build step. ## How was this patch tested? the build system will test this! i used one of my ubuntu testing builds and scped over the modified file. before my fix: https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.7-ubuntu-testing/22/console after my fix: https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.7-ubuntu-testing/23/console Closes #22896 from shaneknapp/remove-extra-whitespace. Authored-by: shane knapp <incomplete@gmail.com> Signed-off-by: hyukjinkwon <gurwls223@apache.org>
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