optimize filter config storage

app/views/setup/filter.scala

@@ -39,8 +39,10 @@ object filter {
             td(
               renderCheckboxes(
                 form,
-                "increment",
-                filter.increment.map(Increment.iso.to).map(_.toString),
+                "increment", {
+                  if (filter.increment.nonEmpty) filter.increment
+                  else List(Increment.Yes, Increment.No)
+                }.map(Increment.iso.to).map(_.toString),
                 translatedIncrementChoices
               )
             )

modules/setup/src/main/FilterConfig.scala

@@ -94,7 +94,10 @@ object FilterConfig {
       "v" -> o.variant.map(_.id),
       "m" -> o.mode.map(_.id),
       "s" -> o.speed.map(_.id),
-      "i" -> o.increment.take(2).map(Increment.iso.to),
+      "i" -> {
+        if (o.increment.size == 1) o.increment.map(Increment.iso.to).some
+        else None
+      },
       "e" -> o.ratingRange.toString
     )
   }