wallet2: automatically adjust fee during backlog

src/wallet/wallet2.cpp

@@ -8118,7 +8118,7 @@ uint32_t wallet2::adjust_priority(uint32_t priority)
       else if (blocks[0].first > 0)
       {
         MINFO("We don't use the low priority because there's a backlog in the tx pool.");
-        return priority;
+        return 2;
       }
 
       // get the current full reward zone
@@ -8163,7 +8163,7 @@ uint32_t wallet2::adjust_priority(uint32_t priority)
       if (P > 80)
       {
         MINFO("We don't use the low priority because recent blocks are quite full.");
-        return priority;
+        return 2;
       }
       MINFO("We'll use the low priority because probably it's safe to do so.");
       return 1;