Fix water heater test for api 10

Author: nickolas-deboom

drivers/SmartThings/matter-thermostat/src/test/test_matter_water_heater.lua

@@ -25,6 +25,7 @@ end
 
 if version.api < 11 then
   clusters.ElectricalEnergyMeasurement = require "ElectricalEnergyMeasurement"
+  clusters.ElectricalPowerMeasurement = require "ElectricalPowerMeasurement"
 end
 
 local WATER_HEATER_EP = 10