Fix media activity crash on menu item visibility change

[wax911]

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Description

Fixes a crash that would happen when trying to access the

• Renames setManageMenuItemIcon to setMenuItemIcons
• Moves malMenuItem into setMenuItemIcons and perform null-ability check on menu item prior to making any changes

Motivation and Context

See linked issue.

How Has This Been Tested?

Checks MenuItem null-ability prior to making changes

Screenshots (if appropriate):

n/a

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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Closes #458

[luk1337]

Works fine, also makes MAL icon show up at the same time as other icons.