Increasing Recent files list from 5 to 10 elements. Fixes arduino#4131

Author: Federico Fissore

app/src/processing/app/Base.java

@@ -81,7 +81,7 @@ public class Base {
   public static final Predicate<UserLibrary> CONTRIBUTED = library -> library.getTypes() == null || library.getTypes().isEmpty() || library.getTypes().contains("Contributed");
   public static final Predicate<UserLibrary> RETIRED = library -> library.getTypes() != null && library.getTypes().contains("Retired");
 
-  private static final int RECENT_SKETCHES_MAX_SIZE = 5;
+  private static final int RECENT_SKETCHES_MAX_SIZE = 10;
 
   private static boolean commandLine;
   public static volatile Base INSTANCE;