Remove unnecessary comment line.

RegressionTests/AWAGun-TrackBack-1/AWAGun-TrackBack-1.in

@@ -19,7 +19,7 @@ REAL Edes    = 1.4e-9; //initial energy in GeV
 REAL gamma   = (Edes+EMASS)/EMASS;
 REAL beta    = sqrt(1-(1/gamma^2));
 REAL P0      = 13.234 * EMASS;  // Inital z-momentum in the distribution file (GeV/c).
-//REAL P0      = beta*gamma * EMASS;  // Inital z-momentum in the distribution file (GeV/c).
+
 //Printing initial energy and momentum to terminal output.
 value , {Edes, P0, OPALVERSION};