Merge pull request #5550 from cvium/revert_underscore_multiversion

(cherry picked from commit f42cee4790e8093e732166b17509cfba25d00a71)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Emby.Naming/Video/VideoListResolver.cs

@@ -236,7 +236,6 @@ namespace Emby.Naming.Video
                 // The CleanStringParser should have removed common keywords etc.
                 return string.IsNullOrEmpty(testFilename)
                        || testFilename[0] == '-'
-                       || testFilename[0] == '_'
                        || Regex.IsMatch(testFilename, @"^\[([^]]*)\]");
             }
 

tests/Jellyfin.Naming.Tests/Video/MultiVersionTests.cs

@@ -327,12 +327,9 @@ namespace Jellyfin.Naming.Tests.Video
                 FullName = i
             }).ToList()).ToList();
 
-            Assert.Single(result);
+            Assert.Equal(7, result.Count);
             Assert.Empty(result[0].Extras);
-            Assert.Equal(6, result[0].AlternateVersions.Count);
-            Assert.False(result[0].AlternateVersions[2].Is3D);
-            Assert.True(result[0].AlternateVersions[3].Is3D);
-            Assert.True(result[0].AlternateVersions[4].Is3D);
+            Assert.Empty(result[0].AlternateVersions);
         }
 
         [Fact]