Draft: Display only current CW for PowerVU on ecm.info file. Patch provided by @cokeaddict

It seems like PowerVU is another CA systems that sends only current CW, like NDS, on ECM response, as it was reported here >> https://board.streamboard.tv/forum/thread/48379-test-resolve-file-ecm-info-broken-when-streamrelay-is-in-use/?postID=616291#post616291

Hence, @cokeaddict has provided us another patch to treat PowerVU in the same way as NDS.

@Token @OptimumPower @WXbet If any of you are able to test PowerVU, please verify that it is working.