add boot drive to lsblk command to better select adjacent lvm device

tasks/capture_lv_device_details.yml

@@ -3,7 +3,8 @@
   ansible.builtin.shell:
     cmd: |
       set -o pipefail
-      lsblk -pl -o name,type,mountpoint | grep -vi swap | grep lvm | head -1 | awk '{ print $1}'
+      lsblk -pl -o name,type,mountpoint {{ bigboot_boot_mount['device'][:-1] }} \
+        | grep -vi swap | grep lvm | head -1 | awk '{ print $1}'
     executable: /bin/bash
   changed_when: false
   register: bigboot_adjacent_lvm