fix premature exit on borg installation check

backup_new.sh

@@ -253,10 +253,10 @@ if [ ! -f "$configDetails" ]; then
     badParam dne "(--details default)" "$configDetails"
 fi
 # is borg installed?
-command -v borg > /dev/null || \
+if ! command -v borg > /dev/null; then
     printf "\n${err}ERROR: BORG is not installed on this system!${norm}\n\n"
-exit 3
-
+    exit 3
+fi
 
 
 ### start logging