AK: Remove Optional::operator bool()

This was causing some obvious-in-hindsight but hard to spot bugs where
we'd implicitly convert the bool to an integer type and carry on with
the number 1 instead of the actual value().

AK/Optional.h

@@ -150,9 +150,6 @@ public:
         return fallback;
     }
 
-    SET_TYPESTATE(consumed)
-    operator bool() const { return m_has_value; }
-
 private:
     // Call when we don't want to alter the consume state
     const T& value_without_consume_state() const