improve default formatting options

Christoph Cullmannrequested to merge
work/small_fixes_clang_format into master
  1. remove AlignTrailingComments: true

=> this avoids multiline comment changes if e.g. one longer member/variable is added with comments behind it

  1. add AllowShortLambdasOnASingleLine: Empty

=> avoid the uglification of lambdas

For more details see the now closed https://phabricator.kde.org/D24568

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