Use os.execv instead of subprocess.run when no further action is taken.

This prevents the underlying file from being marked busy while a
long-running action is happening (e.g. eureka is open).

dcc/record.py

@@ -1,11 +1,11 @@
 import dcc.config
 import dcc.doom_base
-import subprocess
+import os
 
 
 class Record(dcc.doom_base.WadMap):
     def take_action(self, parsed_args):
-        subprocess.run(
+        os.execv(self.dsda,
             [self.dsda] + self.dsda_preamble() +
             ["-record", self.demo_out_path()]
         )