Minor bug in RC2 key expansion function

[Martomate]

There seems to be a missing minus sign in the key expansion function for RC2 on this line. The T1 variable should be negated (which is what they do here).

- var TM = 0xff >> (T1 & 0x07);
+ var TM = 0xff >> (-T1 & 0x07);

This bug only affects RC2 if the "effective key bits" (T1) is not a multiple of 8, and since the default is 128 it probably doesn't affect that many users. Notably, CyberChef is not affected (since they use the default value).

I have verified that 0xff >> (-T1 & 0x07) is equivalent to the expression used in the spec, whereas 0xff >> (T1 & 0x07) is not.