Cast plan description to string

If it's a number, then zero doesn't display
probably because the library is checking for
truthy.

StartPlan.tsx

@@ -145,7 +145,7 @@ export default function StartPlan() {
                   description={
                     settings.showSets
                       ? `${item.total} / ${item.sets ?? 3}`
-                      : item.total
+                      : item.total.toString()
                   }
                   onPress={() => select(index)}
                   left={() => (