bug: Item Mastery progress % is off

[PanGolob]

The Items progress % displayed doesn't match the numbers.

There are two ways this info could work:

1) Total progress

• this would start already at some few percent after level up
• this would show lifetime progress towards the next level
• this would be the most obvious way to interpret the displayed numbers

In this example the number displayed should be 45.25/50 = 90.5%

2) Progress within current level

• this would neatly track progress from 0
• this would show progress since previous level up
• sorta not intuitive in relation to shown numbers

In this example the number displayed should be (45.25-5)/(50-5) = 89.4%

currently it is counted as return 100 * (this.item.masteryPoint - before) / this.masteryNeeded;

gooboo/src/components/partial/horde/Item.vue : 221

which is a mix of both worlds