fix vitest failure by adding expected value to global variable

Signed-off-by: Andrew Backhouse <andrew.backhouse@nextcloud.com>

Author: emberfiend

src/tests/setup.mjs

@@ -12,3 +12,5 @@ Vue.prototype.t = global.t
 Vue.prototype.n = global.n
 Vue.prototype.OC = global.OC
 Vue.prototype.OCA = global.OCA
+// suppress errors from not-explicitly-imported @nc-vue component
+global.appName = 'text'