Don't subtract the additional PE if the target size matches the intended target size

tasks/capture_lv_device_details.yml

@@ -111,6 +111,8 @@
 - name: Subtract one additional PE for shrinking
   ansible.builtin.set_fact:
     bigboot_lv_shrink_size: "{{ bigboot_lv_shrink_size | int - bigboot_lv_vg_pe_size | int }}"
+  when:
+    - bigboot_size_target_fallback | human_to_bytes < bigboot_size_target | human_to_bytes
 
 # - name: Kill the play
 #   ansible.builtin.meta: end_host