[Field Guilde] Return when not viewing image source

[nirewen]

Bug description

When clicking on an item in the field guide, the wiki page opens up every time.

Root cause

The bug is caused because it's not checked on the click handler of the anchor element, whether the option to View Source is enabled.

Solution

Check if the viewingSource boolean has been toggled (from the button on the top) when running the checkViewSource function of the component.

[Silverfeelin]

I must've been pretty sleepy while writing this code to have forgotten that. Thank you very much for the fix!