thread: Rename mask to affinity_masks.

src/core/hle/kernel/svc.cpp

@@ -735,7 +735,7 @@ static ResultCode GetThreadCoreMask(Handle thread_handle, u32* core, u64* mask)
     }
 
     *core = thread->ideal_core;
-    *mask = thread->mask;
+    *mask = thread->affinity_mask;
 
     return RESULT_SUCCESS;
 }