Try sbsettings, it's not upgraded for iOS 7, but you can go into system options and turn on or off the percentage in statusbar, after that you can uninstall every tweak you have installed with sbsettings.
Had the same problem on an iPod touch, after upgrading to iOS 7 and restore from backup, there was the battery percentage on the statusbar, I had enabled with sbsettings ion iOS 6. The only way to get rid, was to install sbsettings an disable the percentage.
With ifile you could also try to change the following to /var/mobile/Library/Preferences/com.apple.springboard.plist
Code:
<key>SBShowBatteryPercentage</key>
<false/>