Touch and hold the icon then it will go to the home screen but do not let go. Drag it to the trash bin and hold it there until it says delete. Let go and it will let you delete it.
This is actually a temporary fix because the app is still in device and as soon as you do a hard reset from stock restore Bootstrap and SuperUser will return... Here is my solution that I have been using that works perfectly..
I ended up figuring out the solution to remove the two apps that did not remove with factory reset after removing root:
Droid X Bootstrapper Complete Removal
* UNINSTALL the Recovery APK (Droid X Bootstrapper) in Settings, Applications
* Reboot
* Run "adb shell" or "Terminal Simulator"
* Run "su"
* Run "mount -o remount,rw /dev/block/mmcblk1p21 /system"
* Run "cp /system/bin/logwrapper.bin /system/bin/logwrapper"
* Reboot
SuperUser Complete Removal
* Root Device
* Install Root Explorer
* Browse to System >> Apps
* Delete all SuperUser.apk (My device had 2)
* Restart Device
* Goto Settings >> Privacy >> Factory Data Reset >> Reset Phone >> Erase Everything
After doing this I had a clean, unrooted, stock device ready for repair service.. NO SBF Required YAHHH!!!