targetspeedadd and targetscoreadd commands doesnt handle repeated errors properly

[JinbaoAlex]

when using the targetspeedadd command, the first time a user makes a mistake it recognises that the input is not integer and asks the user to rectify, but if the user inputs incorrectly again it treats it as an invalid command instead

In addition, if the user previously added a target speed, accidentally enters this command, and wants to cancel instead of changing the previous target, there isnt an official way to do so other than repeating the previously mentioned issue, so maybe a additional function can be added here