Can't open epub files in atril snap

[Sameer Sharma]

When trying to open epub files via atril it crashes down with the following output;

```
** (atril:17984): ERROR **: 10:28:24.658: Unable to spawn a new child process: Failed to spawn child process “/usr/lib/x86_64-linux-gnu/webkit2gtk-4.1/WebKitNetworkProcess” (No such file or directory)
Trace/breakpoint trap
```

[Sameer Sharma (sameersharma2006)]

Disabled epub support for now.
After the first attempt to fix by layouts, it still crashed but with a new output ;

```
** (atril:24715): ERROR **: 12:49:07.001: GDK is not able to create a GL context: The current backend does not support OpenGL.
Trace/breakpoint trap

```

This occurred previously & now also but seems to be a bogus sandboxing quirk.

```
** (WebKitWebProcess:24828): WARNING **: 12:49:06.931: Could not open /sys/class/dmi/id/chassis_type: Failed to open file “/sys/class/dmi/id/chassis_type”: Permission denied

** (WebKitWebProcess:24828): WARNING **: 12:49:06.931: Could not open /sys/firmware/acpi/pm_profile: Failed to open file “/sys/firmware/acpi/pm_profile”: Permission denied

** (WebKitWebProcess:24833): WARNING **: 12:49:06.944: Could not open /sys/class/dmi/id/chassis_type: Failed to open file “/sys/class/dmi/id/chassis_type”: Permission denied

** (WebKitWebProcess:24833): WARNING **: 12:49:06.944: Could not open /sys/firmware/acpi/pm_profile: Failed to open file “/sys/firmware/acpi/pm_profile”: Permission denied
```