Skip checking that Zebra is likely synced to the network tip before r…

…eturning block templates on Testnet.

zebra-rpc/src/methods/get_block_template_rpcs/get_block_template.rs

@@ -161,10 +161,7 @@ where
     Tip: ChainTip + Clone + Send + Sync + 'static,
     SyncStatus: ChainSyncStatus + Clone + Send + Sync + 'static,
 {
-    // TODO:
-    // - Add a `disable_peers` field to `Network` to check instead of `disable_pow()` (#8361)
-    // - Check the field in `sync_status` so it applies to the mempool as well.
-    if network.disable_pow() {
+    if network.is_a_test_network() {
         return Ok(());
     }