TT#29620 Clean TAP test warning: $ on variables in (( )) is unnecessary [SC2004]

Change-Id: Iae706948868cb2afd75d1229aaa51a21345a0870

tools_bin/ngcp-api-delete

@@ -40,7 +40,7 @@ do
 			;;
 	esac
 done
-shift $(($OPTIND - 1))
+shift $((OPTIND - 1))
 
 URL="$1"
 if [ -z "$URL" ] ; then

tools_bin/ngcp-api-get

@@ -40,7 +40,7 @@ do
 			;;
 	esac
 done
-shift $(($OPTIND - 1))
+shift $((OPTIND - 1))
 
 URL="$1"
 if [ -z "$URL" ] ; then

tools_bin/ngcp-api-patch

@@ -55,7 +55,7 @@ do
 			;;
 	esac
 done
-shift $(($OPTIND - 1))
+shift $((OPTIND - 1))
 
 URL="$1"
 if [ -z "$URL" ] ; then

tools_bin/ngcp-api-post

@@ -49,7 +49,7 @@ do
 			;;
 	esac
 done
-shift $(($OPTIND - 1))
+shift $((OPTIND - 1))
 
 URL="$1"
 if [ -z "$URL" ] ; then

tools_bin/ngcp-api-put

@@ -49,7 +49,7 @@ do
 			;;
 	esac
 done
-shift $(($OPTIND - 1))
+shift $((OPTIND - 1))
 
 URL="$1"
 if [ -z "$URL" ] ; then