Reduce block timeout to 10 minutes

Now that #7804 fixed the timeout handling, reduce the block timeout from
20 minutes to 10 minutes. 20 minutes is overkill.

Conflicts:
	src/main.h

Github-Pull: #7832
Rebased-From: 62b9a55

src/main.h

@@ -98,8 +98,8 @@ static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
 /** Average delay between trickled inventory broadcasts in seconds.
  *  Blocks, whitelisted receivers, and a random 25% of transactions bypass this. */
 static const unsigned int AVG_INVENTORY_BROADCAST_INTERVAL = 5;
-/** Block download timeout base, expressed in millionths of the block interval (i.e. 20 min) */
-static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 2000000;
+/** Block download timeout base, expressed in millionths of the block interval (i.e. 10 min) */
+static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000;
 /** Additional block download timeout per parallel downloading peer (i.e. 5 min) */
 static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000;