Set 'max_fsm_queue' default value (back) to 10000

The default value for the 'max_fsm_queue' option was set to 10000 in
commit 79685da90b, and that value is still
documented to be the default.  It was (probably unintentionally) changed
to 5000 in commit 03de853e4f.

It makes sense to keep it larger than the value of mod_stream_mgmt's
'max_ack_queue' option.

src/ejabberd_c2s.erl

@@ -999,4 +999,4 @@ listen_options() ->
      {tls_verify, false},
      {zlib, false},
      {max_stanza_size, infinity},
-     {max_fsm_queue, 5000}].
+     {max_fsm_queue, 10000}].

src/ejabberd_s2s_in.erl

@@ -351,4 +351,4 @@ listen_options() ->
      {tls, false},
      {tls_compression, false},
      {max_stanza_size, infinity},
-     {max_fsm_queue, 5000}].
+     {max_fsm_queue, 10000}].

src/ejabberd_service.erl

@@ -302,7 +302,7 @@ listen_options() ->
      {tls, false},
      {tls_compression, false},
      {max_stanza_size, infinity},
-     {max_fsm_queue, 5000},
+     {max_fsm_queue, 10000},
      {password, undefined},
      {hosts, []},
      {check_from, true},

src/mod_mqtt.erl

@@ -256,7 +256,7 @@ listen_opt_type(max_payload_size) ->
     econf:pos_int(infinity).
 
 listen_options() ->
-    [{max_fsm_queue, 5000},
+    [{max_fsm_queue, 10000},
      {max_payload_size, infinity},
      {tls, false},
      {tls_verify, false}].