move setting of locale for tests to top level build.gradle

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1915910 13f79535-47bb-0310-9956-ffa450edef68

build.gradle

     }
 
     test {
+        // use US locale for tests
+        systemProperty "user.language", "en"
+        systemProperty "user.country", "US"
+
         // make XML test-results available for Jenkins CI
         useJUnitPlatform()
         reports {

poi/build.gradle

 }
 
 test {
-    // use US locale for tests
-    systemProperty "user.language", "en"
-    systemProperty "user.country", "US"
-
     dependsOn { testJar }
 
     systemProperties['junit.jupiter.execution.parallel.enabled'] = 'true'