Mod authors don't give rights to modrinth forever (#56)

Modrinth's terms has an issue similar to what overwolf used to have:

https://curseforge-ideas.overwolf.com/ideas/CF-I-222

pages/legal/terms.vue

@@ -145,7 +145,7 @@
           a worldwide, non-exclusive, royalty-free, and unrestricted license to
           use, reproduce, distribute copies, prepare derivative works of, or
           display Content in connection with Modrinth in any medium and for any
-          purpose (including commercial purposes), which is irrevocable.
+          purpose (including commercial purposes).
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