SubmitRuleOptions: Remove separate defaults() static method

Nobody was calling builder(), and nobody should be using a builder that
isn't initialized with the default values. Only have a single builder
method exposed by this class, and call it builder().

Change-Id: I4bfe96942ebfa9a21c1618fe9e1eee23cff2979d

java/com/google/gerrit/server/project/SubmitRuleOptions.java

@@ -26,11 +26,10 @@ import com.google.gerrit.common.Nullable;
 @AutoValue
 public abstract class SubmitRuleOptions {
   public static Builder builder() {
-    return new AutoValue_SubmitRuleOptions.Builder();
-  }
-
-  public static Builder defaults() {
-    return builder().allowClosed(false).skipFilters(false).rule(null);
+    return new AutoValue_SubmitRuleOptions.Builder()
+        .allowClosed(false)
+        .skipFilters(false)
+        .rule(null);
   }
 
   public abstract boolean allowClosed();