Reorder AddBeserk damage range adjustment calculations

This avoids forcing floating point conversions, the operation can safely be expressed as integral operations given the range of GenerateRnd and the types chosen for MonsterStruct::m*Damage*

Source/missiles.cpp

@@ -1347,12 +1347,12 @@ void AddBerserk(int mi, Point /*src*/, Point dst, int /*midir*/, int8_t /*mienem
 				continue;
 
 			i = 6;
-			auto slvl = static_cast<double>(GetSpellLevel(id, SPL_BERSERK));
+			auto slvl = GetSpellLevel(id, SPL_BERSERK);
 			monster[dm]._mFlags |= MFLAG_BERSERK | MFLAG_GOLEM;
-			monster[dm].mMinDamage = ((double)(GenerateRnd(10) + 20) / 100 + 1) * (double)monster[dm].mMinDamage + slvl;
-			monster[dm].mMaxDamage = ((double)(GenerateRnd(10) + 20) / 100 + 1) * (double)monster[dm].mMaxDamage + slvl;
-			monster[dm].mMinDamage2 = ((double)(GenerateRnd(10) + 20) / 100 + 1) * (double)monster[dm].mMinDamage2 + slvl;
-			monster[dm].mMaxDamage2 = ((double)(GenerateRnd(10) + 20) / 100 + 1) * (double)monster[dm].mMaxDamage2 + slvl;
+			monster[dm].mMinDamage = (GenerateRnd(10) + 120) * monster[dm].mMinDamage / 100 + slvl;
+			monster[dm].mMaxDamage = (GenerateRnd(10) + 120) * monster[dm].mMaxDamage / 100 + slvl;
+			monster[dm].mMinDamage2 = (GenerateRnd(10) + 120) * monster[dm].mMinDamage2 / 100 + slvl;
+			monster[dm].mMaxDamage2 = (GenerateRnd(10) + 120) * monster[dm].mMaxDamage2 / 100 + slvl;
 			int r = (currlevel < 17 || currlevel > 20) ? 3 : 9;
 			monster[dm].mlid = AddLight(monster[dm].position.tile, r);
 			UseMana(id, SPL_BERSERK);