Removes check in the main thread to avoid mocking Android's threading system

app/src/main/java/com/vitorpamplona/amethyst/service/NIP30Parser.kt

@@ -8,8 +8,6 @@ class NIP30Parser {
     val customEmojiPattern: Pattern = Pattern.compile("\\:([A-Za-z0-9_\\-]+)\\:", Pattern.CASE_INSENSITIVE)
 
     fun buildArray(input: String): List<String> {
-        checkNotInMainThread()
-
         val matcher = customEmojiPattern.matcher(input)
         val list = mutableListOf<String>()
         while (matcher.find()) {