tests: Fix after merging two incompatible changes

Oops. We are not using gating, which means that changes are tested
against the "current tip of the branch" and might pass fine there, but
once they are merged, there can well be a conflict between them. This
has just happened.

The EDFA which reported a difference had its VOA set to 0.5. Previously,
this was not taken into assumption.

Fixes: ce51a4d Take explicitly set out_voa value into account in power calculation
Fixes: 280443f add an invocation test with power saturation
Change-Id: Icebbb16d2ef5886d2c9c04cc9a300a6aa08bf245

tests/invocation/transmission_saturated

@@ -12,7 +12,7 @@ max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
     a power reduction of -1.82 is applied
 
 WARNING: WARNING: effective gain in Node east edfa in Lannion_CAS to Morlaix is above user specified amplifier std_low_gain
-max flat gain: 16dB ; required gain: 23.0dB. Please check amplifier type.
+max flat gain: 16dB ; required gain: 23.5dB. Please check amplifier type.
 WARNING: target gain and power in node west edfa in Brest_KLA to Morlaix
      is beyond all available amplifiers capabilities and/or extended_gain_range:
     a power reduction of -1.82 is applied