unittest: pass_gtest: Fix thermal monitor dbus path

unittest: pass_gtest: Fix thermal monitor dbus path

The commit a33200bbbe14 ("pass: Change DBUS interface of thermal monitor")
changed the Thermal Monitor dbus path/interface as following:
In order to support the unittest of Thermal Monitor, fix the thermal monitor
dbus path.

[Before]
DBUS_THERMAL_INTERFACE "org.tizen.system.pass.monitor.thermal"
DBUS_THERMAL_PATH      "/Org/Tizen/System/Pass/Monitor/Thermal"
[After]
DBUS_THERMAL_INTERFACE "org.tizen.system.thermal"
DBUS_THERMAL_PATH      "/Org/Tizen/System/Thermal"

Change-Id: I6adb48a167bd72b91ba495d099bfa32071ba2b5f
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>