domoticz: do not use static version of openssl

Due to the dependency on mosquitto, domoticz depends on !BR2_STATIC_LIBS
so set USE_OPENSSL_STATIC to OFF (default value is ON)

This parameter has been added in release 4.9700.

Fixes:
 - http://autobuild.buildroot.net/results/b1b84b8c12d31b9242b5732fcdd1eb76b1217366



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>