test: Avoid rpc timeout in p2p_headers_sync_with_minchainwork

Author: MarcoFalke

test/functional/p2p_headers_sync_with_minchainwork.py

@@ -27,6 +27,7 @@
 
 class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
     def set_test_params(self):
+        self.rpc_timeout *= 4  # To avoid timeout when generating BLOCKS_TO_MINE
         self.setup_clean_chain = True
         self.num_nodes = 4
         # Node0 has no required chainwork; node1 requires 15 blocks on top of the genesis block; node2 requires 2047