Removes cyclic dependency in function once again

Fixes OpenIPSL#316 and OpenIPSL#358
Looks like a copy-paste mistake from the function calls.

Author: dietmarw

OpenIPSL/Electrical/Controls/PSSE/ES/BaseClasses/invFEX.mo

@@ -1,6 +1,6 @@
 within OpenIPSL.Electrical.Controls.PSSE.ES.BaseClasses;
 function invFEX "Inverse F_EX function for initialization"
-  input Real K_C=K_C;
+  input Real K_C;
   input Real Efd0;
   input Real Ifd0;
   output Real VE0;