refactor: rename variable => _comp__init_original_set_v

This renames as `BASH_COMPLETION_ORIGINAL_V_VALUE =>
_comp__init_original_set_v` because the variable is only for the
internal use in the bash-completion initialization.

Author: akinomyoga

bash_completion

@@ -26,9 +26,9 @@
 BASH_COMPLETION_VERSINFO=(2 11 0)
 
 if [[ $- == *v* ]]; then
-    BASH_COMPLETION_ORIGINAL_V_VALUE="-v"
+    _comp__init_original_set_v="-v"
 else
-    BASH_COMPLETION_ORIGINAL_V_VALUE="+v"
+    _comp__init_original_set_v="+v"
 fi
 
 if [[ ${BASH_COMPLETION_DEBUG-} ]]; then
@@ -2462,7 +2462,7 @@ unset -v _comp__init_user_file
 unset -f have
 unset -v have
 
-set $BASH_COMPLETION_ORIGINAL_V_VALUE
-unset -v BASH_COMPLETION_ORIGINAL_V_VALUE
+set $_comp__init_original_set_v
+unset -v _comp__init_original_set_v
 
 # ex: filetype=sh