Fix TwitterScraperTest

[ullf]

To fix an error:
org.loklak.harvester.TwitterScraperTest > testSimpleSearch FAILED
java.time.format.DateTimeParseException at TwitterScraperTest.java:198

org.loklak.TestRunner > org.loklak.harvester.TwitterScraperTest.testSimpleSearch FAILED
java.time.format.DateTimeParseException at TwitterScraperTest.java:198

[codecov-io]

Codecov Report

Merging #1633 into development will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             development   #1633   +/-   ##
=============================================
  Coverage           9.73%   9.73%           
  Complexity           459     459           
=============================================
  Files                211     211           
  Lines              19427   19427           
  Branches            3578    3578           
=============================================
  Hits                1891    1891           
  Misses             17194   17194           
  Partials             342     342

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[vibhcool]

could you tag the issue no. with the PR? changes look good to me, but the issue isn't clear

[vibhcool]

related issue -> #1632
you may set PR heading like this one -> https://github.com/loklak/loklak_server/pull/1557/commits