fix double escaping

frontend-maven-plugin/src/it/yarn-integration/verify.groovy

@@ -4,4 +4,4 @@ assert new File(basedir, 'node_modules/less/package.json').exists() : "Less depe
 
 String buildLog = new File(basedir, 'build.log').text
 assert buildLog.contains('BUILD SUCCESS') : 'build was not successful'
-assert buildLog.replace(File.separatorChar, '/' as char).matches('(?s).+Unpacking .+\\Q/local-repo/com/github/eirslett/yarn/[1-9\.]*/yarn-[1-9\.]*.tar.gz\\E into .+/target/node/yarn.+') : 'incorrect local repository location'
+assert buildLog.replace(File.separatorChar, '/' as char).matches('(?s).+Unpacking .+\\Q/local-repo/com/github/eirslett/yarn/[1-9\\.]*/yarn-[1-9\\.]*.tar.gz\\E into .+/target/node/yarn.+') : 'incorrect local repository location'