Reenable audio.conf prior to first run

ubuntustudio/modules/before_bootloader_context.conf

@@ -12,6 +12,8 @@ firmwareType:
              timeout: 10
         -    command: if [ -f /etc/apt/sources.list.d/dvd.list ]; then rm /etc/apt/sources.list.d/dvd.list; fi
              timeout: 10
+        -    command: if [ -f /etc/security/limits.d/audio.conf.disabled ]; then mv /etc/security/limits.d/audio.conf.disabled /etc/security/limits.d/audio.conf; fi
+             timeout: 10
         -    command: apt-get update
              timeout: 120
         -    command: apt install -y --no-upgrade -o Acquire::gpgv::Options::=--ignore-time-conflict grub-efi-$(if grep -q 64 /sys/firmware/efi/fw_platform_size; then echo amd64-signed; else echo ia32; fi)