Moved the check of negative flags for hydro pairs to the debug code. That...

Moved the check of negative flags for hydro pairs to the debug code. That never happens in real life code.

src/scheduler.c

@@ -1309,12 +1309,12 @@ void scheduler_reweight(struct scheduler *s, int verbose) {
 #ifdef SWIFT_DEBUG_CHECKS
           if (t->flags < 0) error("Negative flag value!");
 #endif
-	  cost = 3.f * (wscale * count_i) * count_j * sid_scale[t->flags];
+          cost = 3.f * (wscale * count_i) * count_j * sid_scale[t->flags];
         } else {
 #ifdef SWIFT_DEBUG_CHECKS
           if (t->flags < 0) error("Negative flag value!");
 #endif
-	  cost = 2.f * (wscale * count_i) * count_j * sid_scale[t->flags];
+          cost = 2.f * (wscale * count_i) * count_j * sid_scale[t->flags];
         }
         break;