Remove redundant keyword

Author: garydgregory

src/main/java/org/apache/commons/cli/Option.java

@@ -257,8 +257,8 @@ public Builder option(final String option) throws IllegalArgumentException {
          * @return this builder.
          */
         public Builder optionalArg(final boolean optionalArg) {
-            if (optionalArg && this.argCount == UNINITIALIZED) {
-                this.argCount = 1;
+            if (optionalArg && argCount == UNINITIALIZED) {
+                argCount = 1;
             }
             this.optionalArg = optionalArg;
             return this;