More HullMods 1.7.0 bugs and icons

Anti Armor Ammunition:
-Icon has been updated

Exploration Refit
-Now correctly reduces effect if installed with efficiency overhaul

Fuel Additive
-Fuel consumption reduction reduced from 25% to 20%
-Maintenance increase increased from 20% to 25%
-Icon has been updated

Torpedo Spec:
-Icon has been updated

Unstable Shields
-Time to get 100% stable increased from 3 to 6 seconds
-Now shield starts to get charge only after 3 second of being disabled

Weapon Inhibitor
-Now correctly reduces rate of fire for ballistic weapons