Truncate frequencies used in calibration

For calibration, the log10(frequnecy_array) causes log warning messaged (due to taking the log of 0). To resolve this, and also to provide a slight speed up, this only calculates the values in the frequency mask

bilby/gw/detector/interferometer.py

@@ -488,7 +488,7 @@ class Interferometer(object):
             parameters['ra'], parameters['dec'], parameters['geocent_time'])
         dt = parameters['geocent_time'] + time_shift - self.strain_data.start_time
 
-        signal_ifo[self.frequency_mask] = signal_ifo * np.exp(
+        signal_ifo[self.frequency_mask] = signal_ifo[self.frequency_mask] * np.exp(
             -1j * 2 * np.pi * dt * self.frequency_array[self.frequency_mask])
 
         signal_ifo[self.frequency_mask] *= self.calibration_model.get_calibration_factor(