Fix QoL special attack handling

[MuffinKid23]

Summary

• align QoL special attack execution with the working AIO Fighter flow
• stop caching/re-querying the current NPC and re-clicking Attack after attempting a spec
• call Microbot.getSpecialAttackConfigs().useSpecWeapon() whenever QoL spec weapon is enabled, the player is not in full Guthan's, and the player is already interacting
• bump QoLPlugin to 1.8.16

Testing

• Confirmed in-game that QoL now swaps to the configured special attack weapon and activates special attack.
• javac --release 11 -cp C:\Users\lobit\.microbot\microbot-2.6.19.jar;C:\Users\lobit\.runelite\microbot-plugins\QoLPlugin.jar ... SpecialAttackScript.java
• javac --release 11 -cp C:\Users\lobit\.microbot\microbot-2.6.19.jar;C:\Users\lobit\.runelite\microbot-plugins\QoLPlugin.jar;<lombok-1.18.30.jar> ... PluginConstants.java QoLPlugin.java
• Full Gradle build was not run locally because this Windows environment does not have the required Adoptium JDK 11 toolchain installed.