Convert booster attribute to value before applying

Changes to boostermissilevelocitypenalty.py:
Get booster attribute value using booster.getModifiedItemAttr()
before attempting to apply it to avoid type error

eos/effects/boostermissilevelocitypenalty.py

@@ -14,4 +14,4 @@ attr = "boosterMissileVelocityPenalty"
 
 def handler(fit, booster, context):
     fit.modules.filteredChargeBoost(lambda mod: mod.charge.requiresSkill("Missile Launcher Operation"),
-                                    "maxVelocity", attr)
+                                    "maxVelocity", booster.getModifiedItemAttr(attr))