Don't duplicate DiffLineType information in constructor

Author: jcansdale

src/GitHub.InlineReviews/Models/InlineCommentThreadModel.cs

@@ -31,7 +31,6 @@ public InlineCommentThreadModel(
             string originalCommitSha,
             int originalPosition,
             IList<DiffLine> diffMatch,
-            DiffChangeType diffLineType,
             IEnumerable<IPullRequestReviewCommentModel> comments)
         {
             Guard.ArgumentNotNull(relativePath, nameof(relativePath));
@@ -40,7 +39,7 @@ public InlineCommentThreadModel(
 
             Comments = comments.ToList();
             DiffMatch = diffMatch;
-            DiffLineType = diffLineType;
+            DiffLineType = diffMatch[0].Type;
             OriginalCommitSha = originalCommitSha;
             OriginalPosition = originalPosition;
             RelativePath = relativePath;

src/GitHub.InlineReviews/Services/PullRequestSessionService.cs

@@ -99,13 +99,11 @@ public IReadOnlyList<IInlineCommentThreadModel> BuildCommentThreads(
                     continue;
                 }
 
-                var diffLineType = firstLine.Type;
                 var thread = new InlineCommentThreadModel(
                     relativePath,
                     comments.Key.Item1,
                     comments.Key.Item2,
                     diffLines,
-                    diffLineType,
                     comments);
                 threads.Add(thread);
             }