Increase timeout in dynamic_ha:nodes_policy_should_pick_master_from_its_params

This test still flakes occassionally even with the dynamic wait. The original
five second timeout might have been a bit short, as this test takes around 70-90
seconds when successful, so I'm bumping the timeout to 10s to see if it helps.

(cherry picked from commit cd2fee1)
(cherry picked from commit 3011080)

Author: HoloRin

test/dynamic_ha_SUITE.erl

@@ -382,7 +382,7 @@ nodes_policy_should_pick_master_from_its_params(Config) ->
     SSPids = ?awaitMatch(SSPids when is_list(SSPids),
                                      proplists:get_value(synchronised_slave_pids,
                                                          find_queue(?QNAME, A)),
-                                     5000),
+                                     10000),
 
     %% Choose slave that isn't the first sync slave. Cover a bug that always
     %% chose the first, even if it was not part of the policy