Fix "wrong number of arguments" when coverageDebug is enabled

Author: maiflai

src/functionalTest/resources/projects/scala-single-module/build.gradle

@@ -27,6 +27,8 @@ test {
 scoverage {
     minimumRate = 0.3
     coverageType = org.scoverage.CoverageType.Line
+    // verify that debug mode works
+    coverageDebug = true
 }
 
 if (hasProperty("excludedFile")) {

src/main/groovy/org/scoverage/ScoverageWriter.java

@@ -105,7 +105,7 @@ public void write(Set<File> sourceDirs,
                 File.separator +
                 Constants.XMLReportFilename());
             if (coverageDebug) {
-                ScoverageXmlWriter writerDebug = cst.newInstance(sourceDirsSeq, reportDir, true);
+                ScoverageXmlWriter writerDebug = cst.newInstance(sourceDirsSeq, reportDir, true, new Some<>(sourceEncoding));
                 writerDebug.write(coverage);
                 logger.info("[scoverage] Written XML report with debug information to " +
                     reportDir.getAbsolutePath() +