Correct association of PSU PWM Sensor

Correct association of PSU PWM Sensor which can make redfish get correct PSU
PWM Fan sensors in Thermal/Fans entries.

Tested:
Insert one 1100W PSU and check Web redfish page, below entry can be found.
https://ip/redfish/v1/Chassis/Flextronics_S_1100ADU00_201_PSU_1/Thermal
"@odata.id": "/redfish/v1/Chassis/Flextronics_S_1100ADU00_201_PSU_1/Thermal#/
Fans/1",
"@odata.type": "#Thermal.v1_3_0.Fan",
"MaxReadingRange": 100,
"MemberId": "Pwm_PSU1_Fan_1",
"MinReadingRange": 0,
"Name": "Pwm PSU1 Fan 1",
"Reading": 29,
"ReadingUnits": "Percent",
"Status": {
    "Health": "OK",
    "State": "Enabled"
}

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: I8f068ef3e5bd246a2432e180b1c86dbd6b0bad97
diff --git a/src/PSUSensorMain.cpp b/src/PSUSensorMain.cpp
index 14d1a69..81fde4d 100644
--- a/src/PSUSensorMain.cpp
+++ b/src/PSUSensorMain.cpp
@@ -133,7 +133,7 @@
 
         pwmSensors[psuName + labelHead] = std::make_unique<PwmSensor>(
             "Pwm_" + psuName + "_" + pwmName.second, pwmPathStr, objectServer,
-            interfacePath + "/" + psuName + " " + pwmName.second);
+            interfacePath + "_" + pwmName.second);
     }
 }