Deprecate the "disable unified profiles" feature

The Community Console no longer supports the old per-forum profiles, so
this feature has stopped working.

Change-Id: I8ff6507a03adca483dda3985db92dab486e419e3
diff --git a/src/common/optionsPrototype.json5 b/src/common/optionsPrototype.json5
index 5db7285..a5caa3e 100644
--- a/src/common/optionsPrototype.json5
+++ b/src/common/optionsPrototype.json5
@@ -95,11 +95,6 @@
     context: 'options',
     killSwitchType: 'option',
   },
-  'disableunifiedprofiles': {
-    defaultValue: false,
-    context: 'options',
-    killSwitchType: 'option',
-  },
 
   // Experiments:
   'threadlistavatars': {
@@ -146,4 +141,9 @@
     context: 'deprecated',
     killSwitchType: 'deprecated',
   },
+  'disableunifiedprofiles': {
+    defaultValue: false,
+    context: 'deprecated',
+    killSwitchType: 'deprecated',
+  },
 }