[Bluetooth] Enable Bluetooth debug toggle by default

To prepare for enabling debug logs by default for Googlers, this shows
the debug toggle by default. This does NOT enable the debug logs, but
this only shows the debug log toggle which only Googlers can see and
toggle the debug log on or off manually.

Bug: b:172273364
Change-Id: I01461177fc75d556a5d0786dcd3eb3a5a7325215
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536849Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Sonny Sasaka <sonnysasaka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827496}

chromeos/constants/chromeos_features.cc

@@ -531,7 +531,7 @@ const base::Feature kSessionManagerLongKillTimeout{
 
 // Enables or disables a toggle to enable Bluetooth debug logs.
 const base::Feature kShowBluetoothDebugLogToggle{
-    "ShowBluetoothDebugLogToggle", base::FEATURE_DISABLED_BY_DEFAULT};
+    "ShowBluetoothDebugLogToggle", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables showing the battery level in the System Tray and Settings
 // UI for supported Bluetooth Devices.