[Bug] powershell encoded command fails

Bug

**Describe the feature request or bug**
The encoded command for the powershell launcher fails to execute.

**To Reproduce**
Steps to reproduce the behavior:
1. create powershell launcher
2. copy encoded command output
3. paste command into windows terminal

**Expected behavior**
target connects to Covenant

**Screenshots**
no screen shots available

**Covenant Server Information:**
- OS: kali and windows
- Docker or Native: Native

**Browser Information:**
- Browser firefox and brave
- Version 78.11.0esr and 1.27.109

**Target Information (System that implant is running on):**
- OS: windows
- Version server 2019 standard

**Additional context**
I get the standard powershell output that echoes to the screen when you enter in a command incorrectly. Exact verbiage at the top is: "cannot process the command because the value specified with -EncodedCommand is not properly encoded. The value must be Base64 encoded."