remove a few warnings

src/main/java/carpet/helpers/OptimizedExplosion.java

@@ -333,7 +333,7 @@ public class OptimizedExplosion
 
     private static void getAffectedPositionsOnPlaneX(Explosion e, int x, int yStart, int yEnd, int zStart, int zEnd)
     {
-        if (rayCalcDone == false)
+        if (!rayCalcDone)
         {
             final double xRel = (double) x / 15.0D * 2.0D - 1.0D;
 
@@ -356,7 +356,7 @@ public class OptimizedExplosion
 
     private static void getAffectedPositionsOnPlaneY(Explosion e, int y, int xStart, int xEnd, int zStart, int zEnd)
     {
-        if (rayCalcDone == false)
+        if (!rayCalcDone)
         {
             final double yRel = (double) y / 15.0D * 2.0D - 1.0D;
 
@@ -379,7 +379,7 @@ public class OptimizedExplosion
 
     private static void getAffectedPositionsOnPlaneZ(Explosion e, int z, int xStart, int xEnd, int yStart, int yEnd)
     {
-        if (rayCalcDone == false)
+        if (!rayCalcDone)
         {
             final double zRel = (double) z / 15.0D * 2.0D - 1.0D;