.mcworld, mcpack, and mcaddon files with ampersand in name won't import

.mcworld files with an ampersand in their name won't import when opened.

 Tested on a Nexus 6P running Android 8.1.

To reproduce:

• rename a .mcworld file to "test&case.mcworld"
• select the renamed mcworld file in a file manager, and select Minecraft to start the import
• Minecraft opens

Expected: Minecraft then pops up the "Importing level" banner and imports the .mcworld file

Actual: nothing happens; Minecraft enters the title screen without importing the level.