tdf#97637 Fixed Tab size of beanshell editor to 4

Change-Id: Ifeb73ab210d9d955e502fab3e3ec993081625945
Reviewed-on: https://gerrit.libreoffice.org/22473
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

scripting/java/com/sun/star/script/framework/provider/beanshell/PlainSourceView.java

@@ -101,6 +101,7 @@ public class PlainSourceView extends JScrollPane implements
                 // What to do here
         }
         ta = new JTextArea();
+        ta.setTabSize(4);
         ta.setRows(15);
         ta.setColumns(40);
         ta.setLineWrap(false);