tutorials: Removed unnecessary spaces between parentheses and values in vectors

tutorials/mesh/snappyHexMesh/flange/system/decomposeParDict

@@ -21,13 +21,13 @@ method          ptscotch; //simple;
 
 simpleCoeffs
 {
-    n               ( 2 2 1 );
+    n               (2 2 1);
     delta           0.001;
 }
 
 hierarchicalCoeffs
 {
-    n               ( 1 1 1 );
+    n               (1 1 1);
     delta           0.001;
     order           xyz;
 }