Nix/tests: fix typo

Author: fufexan

nix/tests/default.nix

@@ -71,7 +71,7 @@ in {
 
       # Run gtests
       print("Running gtests")
-      exit_status, _out = machine.execute("su - alice -c 'hyprland_gtests 2>&1 | tee /tmp/gtestslog; exit ''${PIPESTATUS[0]}")
+      exit_status, _out = machine.execute("su - alice -c 'hyprland_gtests 2>&1 | tee /tmp/gtestslog; exit ''${PIPESTATUS[0]}'")
       machine.execute(f'echo {exit_status} > /tmp/exit_status_gtests')
 
       # Run hyprtester testing framework/suite