Land rapid7#5415, changes spaces in PSH shell output

Author: HD Moore

lib/msf/base/sessions/powershell.rb

@@ -58,8 +58,8 @@ def shell_command(cmd)
       buff << res
       if buff.match(/#{endm}/)
         # if you see the end marker, read the buffer from the start marker to the end and then display back to screen
-        buff = buff.split(/#{strm}/)[-1]
-        buff.gsub!(/PS .*>/, '')
+        buff = buff.split(/#{strm}\r\n/)[-1]
+        buff.gsub!(/\nPS .*>/, '')
         buff.gsub!(/#{endm}/, '')
         return buff
       end