Hardcode ports without calculation

src/main/resources/mailbox-univer-ze.properties

@@ -1,8 +1,8 @@
 # TCP port used for the DMTP server socket
-dmtp.tcp.port=11620+4
+dmtp.tcp.port=11624
 
 # TCP port used for the DMAP server socket
-dmap.tcp.port=11620+5
+dmap.tcp.port=11625
 
 # mail domain managed by the mailbox server
 domain=univer.ze
@@ -19,4 +19,4 @@ root_id=root-nameserver
 registry.host=localhost
 
 # RMI registry port
-registry.port=11620+9
+registry.port=11629