dbus-sdr: Update bitset usage for VR profile status

The assertions for getVrEventStatus is not used properly. It used to be
different with uint8_t which is set to 1 << index. With bitset, we can
just set it to the index directly. Wrapped with htole16 just in case.

Tested:
The profile status still works. With correct response this time
```
$ ipmitool raw 0x4 0x2b 0xd3
 00 02 00 00 00

// Update the profile
$ ipmitool raw 0x4 0x30 0xd3 0 0 4 0 0 0 0 0 0

$ ipmitool raw 0x4 0x2b 0xd3
 00 04 00 00 00
```

Change-Id: Ic59e88b65ff9b45ba759a8c62a141cf14e8bdc20
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/dbus-sdr/sensorcommands.cpp b/dbus-sdr/sensorcommands.cpp
index 05f5edf..1c19986 100644
--- a/dbus-sdr/sensorcommands.cpp
+++ b/dbus-sdr/sensorcommands.cpp
@@ -499,14 +499,10 @@
     std::size_t index =
         static_cast<std::size_t>(std::distance(profiles->begin(), itr));
 
-    // map index to reponse event assertion bit.
-    if (index < 8)
+    // map index to response event assertion bit.
+    if (index < 16)
     {
-        assertions.set(1u << index);
-    }
-    else if (index < 15)
-    {
-        assertions.set(1u << (index - 8));
+        assertions.set(index);
     }
     else
     {