twoPhaseEulerFoam/bed tutorial: update for new location of alpha solver settings

tutorials/multiphase/twoPhaseEulerFoam/bed/system/fvSolution

@@ -53,6 +53,12 @@ solvers
         relTol          0;
     }
 
+    alpha1
+    {
+        nAlphaCorr      2;
+        nAlphaSubCycles 3;
+    }
+
     alpha
     {
         solver          PCG;
@@ -72,12 +78,9 @@ PIMPLE
 {
     nCorrectors     2;
     nNonOrthogonalCorrectors 0;
-    nAlphaCorr      2;
-    nAlphaSubCycles 3;
     correctAlpha    yes;
     pRefCell        0;
     pRefValue       0;
 }
 
-
 // ************************************************************************* //