Minor fix in PreprocessorResult dimension reporting.

Fix issue reported by @codeanticode within PreprocessorResult.java where the height was not being returned correctly.

java/src/processing/mode/java/preproc/PreprocessorResult.java

@@ -193,6 +193,6 @@ public class PreprocessorResult {
    *    given.
    */
   public String getSketchHeight() {
-    return sketchWidth;
+    return sketchHeight;
   }
 }