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I often accidently click on that icon on lockscreen when I'm unlocking the phone, and then the camera starts. Please make it possible to remove this icon but keep the fast start on the camera button.
I do not think that is possible by default,if you disable quick launch from camera settings it might work but the button would not trigger the camera.You could look on google play for some apps.
http://talk.sonymobile.com/t5/Xperia-C/Remove-lock-screen-camera-icon/m-p/433573#M86
I understood the problem wrong, so I edited my comment.
I never use the camera button. A shortcut on the homescreen is much easier for me.
for me it seems long way
click on that icon press and hold keep touched find the way to unlock it
very long way near impossible