You could try to see what the name of the capture is by issuing the command:
FTD-1# show capture
capture MYCAP type raw-data buffer 1534 interface inside [Buffer Full - 1225 bytes]
match ip any any
As you type this, you will not likely be able to see that you are typing anything but you are. Just type the command and hit enter. The result will be on the screen for just a split second but you could disconnect your session right after hitting enter and scroll back in the buffer and find it. Once you have the name of the capture, reconnect to the FTD and issue the command no capture [capture-name]
FTD-1# no capture MYCAP