Fix Mortimer dialogue loop when delivering the pickaxe

[lucastsantos]

Description

Mortimer was not allowing the player to complete the "Joining the Explorers" quest.
The player was getting stuck into a loop of always having to provide a dwarven pickaxe and not advancing the questline.

Behaviour

Actual

Expected

The expected was to fill the quest and move to another missions.

Fixes

Angus has a different value for this section, so I've aligned to Mortimer set the same value:

otservbr-global/data/npc/angus.lua

Lines 390 to 396 in 7b19d81

	if player:removeItem(4845, 1) then
	player:setStorageValue(Storage.ExplorerSociety.JoiningTheExplorers, 5)
	player:setStorageValue(Storage.ExplorerSociety.QuestLine, 5)
	npcHandler:say({
	"Excellent, you brought just the tool we need! Of course it was only a simple task. However ...",
	"I officially welcome you to the explorer society. From now on you can ask for missions to improve your rank."
	}, npc, creature)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

Go to Mortimer, ask to join, then for a mission and delivery the pickaxe.
It might help to give you a lot of pickaxe to test with:

/i 4845, 5

Test Configuration:

• Server Version: 1.4.0
• Client: 12.86
• Operating System: Windows

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works