Java cleanup, remove the rest of the unnecessary casts

Change-Id: Ia61d250f6b3711abc29569c5ece38a6f87e38daa
Reviewed-on: https://gerrit.libreoffice.org/3432
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

scripting/java/com/sun/star/script/framework/io/XInputStreamImpl.java

@@ -73,7 +73,7 @@ public class XInputStreamImpl implements XInputStream
         long bytesSkipped = 0;
         try
         {
-            bytesSkipped = is.skip( (long)nBytesToSkip );
+            bytesSkipped = is.skip( nBytesToSkip );
         }
         catch ( IOException e )
         {