tac reload doubling on backpack weapons

[blackdav123]

Description

Clicking the powerpack with my minigun forced it to tac reload twice doubling the time it took to connect the gun.
Guessing tac reload PR didnt account for guns that already had that functionality.

Test Merges

#15682: 'Smooth move update' by Lumipharon at commit a1f2eeb30e
#15693: 'Removes the ability to build cades on tadpoles, adds a new mapping helper and flag' by Wisemonster at commit 7257aeeff2
#15694: 'Removes minimum pop from Transport Crewmen' by Wisemonster at commit aa5314de1a

Reproduction Steps

1. Equip minigun and powerpack
2. Click powerpack with minigun to attach it
3. Progress bar goes twice and the gun attaches then unattaches then reattaches
4. Get wrecked by any xeno with a stun twice as hard

Screenshots

No response