Refactor LtDfStickyTest to remove unnecessary public access modifier.

Author: yegor256

src/test/java/org/eolang/lints/LtDfStickyTest.java

@@ -83,7 +83,7 @@ public Collection<Defect> apply(final Object entity) {
             return Collections.emptyList();
         }
 
-        public int count() {
+        int count() {
             return this.cnt;
         }
     }