Bugfix of EventLoaderTimepix4 ftoa_rise and clock dll correction

Had a small bug in the ftoa_rise decoding where in the calling of the function a bitshift was performed that should not be there. This resulted in an incorrect time reconstruction

In addition fixed the clock dll correction as it was always shifting things down to 0. Since it anyway is just a static offset I decided to avoid possible complications via subtractions and now simply changed it to an addition of the correction.