Fix ordering of PF tech level patch (#1934)

Using :FOR[RealismOverhaul] means the patch may be ordered before RO's
 own patch on some platforms (MM is not consistent about folder order),
 with the result that 'density' ends up being 0.05 and thus the first
 upgrade is a huge downgrade.
Instead, use :AFTER[RealismOverhaul] to ensure the correct ordering.

GameData/RP-0/Tree/PFTechLevels.cfg

@@ -66,7 +66,7 @@ PARTUPGRADE
 	description = You can now use 2010s advanced composite monocoque fairings. The new minimum density is 0.040, compared with 0.042 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
 }
 
-@PART:HAS[@MODULE[ProceduralFairingSide]]:FOR[RealismOverhaul]
+@PART:HAS[@MODULE[ProceduralFairingSide]]:AFTER[RealismOverhaul]
 {
 	@MODULE[ProceduralFairingSide]
 	{