Make sure CDF goes to 1 smoothly (#261)

* Make sure CDF goes to 1 smoothly

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

fuse/plugins/pmt_and_daq/pmt_response_and_daq.py

@@ -283,7 +283,10 @@ def init_pmt_current_templates(self):
 
         # Interpolate on cdf ensures that each spe pulse would sum up to 1 pe*sample duration^-1
         pe_pulse_function = interp1d(
-            self.pe_pulse_ts, np.cumsum(self.pe_pulse_ys), bounds_error=False, fill_value=(0, 1)
+            self.pe_pulse_ts,
+            np.cumsum(self.pe_pulse_ys) / np.sum(self.pe_pulse_ys),
+            bounds_error=False,
+            fill_value=(0, 1),
         )
 
         # Samples are always multiples of sample_duration