Fix DLAY delay changing during save+load

by rounding temperatures to nearest instead of always flooring.

Effect on DLAY delay:
Room temperature offset - loaded as whole number of degrees C, so rounding to nearest deg C gives the same number as flooring.
Full - loaded as whole number of K = original whole deg C - 0.15. Rounding to nearest deg C means the whole deg C delay from before saving is used as the number of frames to delay, instead of deg C - 1 if flooring was used.

src/client/GameSave.cpp

@@ -1914,13 +1914,13 @@ char * GameSave::serialiseOPS(unsigned int & dataLength)
 				//Store temperature as an offset of 21C(294.15K) or go into a 16byte int and store the whole thing
 				if(fabs(particles[i].temp-294.15f)<127)
 				{
-					tempTemp = (particles[i].temp-294.15f);
+					tempTemp = floor(particles[i].temp-294.15f+0.5f);
 					partsData[partsDataLen++] = tempTemp;
 				}
 				else
 				{
 					fieldDesc |= 1;
-					tempTemp = particles[i].temp;
+					tempTemp = (int)(particles[i].temp+0.5f);
 					partsData[partsDataLen++] = tempTemp;
 					partsData[partsDataLen++] = tempTemp >> 8;
 				}

src/simulation/elements/DLAY.cpp

@@ -64,7 +64,7 @@ int Element_DLAY::update(UPDATE_FUNC_ARGS)
 					continue;
 				if ((r&0xFF)==PT_SPRK && parts[i].life==0 && parts[r>>8].life>0 && parts[r>>8].life<4 && parts[r>>8].ctype==PT_PSCN)
 				{
-					parts[i].life = (int)(parts[i].temp-273.15);
+					parts[i].life = (int)(parts[i].temp-273.15f+0.5f);
 				}
 				else if ((r&0xFF)==PT_DLAY)
 				{