sources: fix dummy names being suggested as other names.

Fix placeholder names like weibo_1234, bilibili_1234, nijie1234, and nicoseiga1234 being suggested
as Other Names when creating new artist entries. These are meant to be placeholders for the tag
name, not used as other names.

test/unit/sources/bilibili_test.rb

@@ -18,6 +18,7 @@ module Sources
         ],
         page_url: "https://t.bilibili.com/686082748803186697",
         artist_name: "哈米伦的弄笛者",
+        other_names: ["哈米伦的弄笛者"],
         tag_name: "bilibili_11742550",
         profile_url: "https://space.bilibili.com/11742550",
         tags: [],
@@ -39,6 +40,7 @@ module Sources
         ],
         page_url: "https://t.bilibili.com/722702993036673113",
         artist_name: "星尘Official",
+        other_names: ["星尘Official"],
         tag_name: "bilibili_15817819",
         profile_url: "https://space.bilibili.com/15817819",
         tags: [],
@@ -76,6 +78,7 @@ module Sources
         ],
         artist_commentary_title: nil,
         artist_name: "明日方舟",
+        other_names: ["明日方舟"],
         profile_url: "https://space.bilibili.com/161775300",
         page_url: "https://h.bilibili.com/83341894",
         tag_name: "bilibili_161775300",
@@ -100,6 +103,7 @@ module Sources
         ],
         page_url: "https://www.bilibili.com/read/cv7360489",
         artist_name: "时光印记2016",
+        other_names: ["时光印记2016"],
         tag_name: "bilibili_285452636",
         profile_url: "https://space.bilibili.com/285452636",
         artist_commentary_title: "斗罗大陆 4，觉醒后的古月娜（第一期）",