@JimBoom & blniko
This not a solution I would recommend to anyone. The PHP code you supplied simply disables all of Contact Form 7's Javascript.
It does stop the arrow spinnning but it's a purely cosmetic change which achieves nothing. You might as well let the arrow spin.
Disabling Contact Form 7's Javascript will mean that you don't have any field validation amongst other things.
Importantly it doesn't deal with the core issue which is a Javascript conflict in your theme or one of your other plugins.
You do have my sympathy, Javascript conflicts can be very difficult to solve - see Solving CF7 Javascript Conflicts for some guidance.