Add Invalid_argument active pattern to fix failing chop_extension test

[jmquigs]

• The test is failing because it matches on an Invalid_argument exception, but the function actually throws System.ArgumentException
• An Invalid_argument pattern was in the original powerpack version of this file: https://github.com/fsprojects/powerpack/blob/93fd7200f7f46b2be281a1295a96e4a8f3ef6c7b/src/FSharp.PowerPack.Compatibility/pervasives.fs That pattern was removed sometime before this file was committed here, but given that the "Failure" pattern was added here which does something similar, it seems to be a valid way to fix this issue

[dsyme]

LGTM