Make nogroups work on nvidia again

Remove workaround from commit 623e682 ("temporary fix for
nvidia/nogroups/noroot issue (#3644, #841)", 2020-10-02) and from commit
cb460c3 ("more nvidia (#3644)", 2020-10-03).

The handling of the "render" and "video" groups is separate from
`nogroups` now, so disabling `nogroups` on nvidia shouldn't be necessary
anymore.  See the previous 2 commits for details.

See also the discussion on PR #4632.

src/firejail/profile.c

@@ -416,13 +416,7 @@ int profile_check_line(char *ptr, int lineno, const char *fname) {
  return 0;
  }
  else if (strcmp(ptr, "nogroups") == 0) {
- // nvidia cards require video group; disable nogroups
- if (access("/dev/nvidiactl", R_OK) == 0 && arg_no3d == 0) {
- fwarning("Warning: NVIDIA card detected, nogroups command disabled\n");
- arg_nogroups = 0;
- }
- else
- arg_nogroups = 1;
+ arg_nogroups = 1;
  return 0;
  }
  else if (strcmp(ptr, "nosound") == 0) {