Tweak work-antonym relationship

Author: myieye

src/SIL.Harmony.Sample/CrdtSampleKernel.cs

@@ -61,8 +61,8 @@ public static IServiceCollection AddCrdtDataSample(this IServiceCollection servi
                         .WithMany()
                         .UsingEntity<WordTag>();
                     builder.HasOne((w) => w.Antonym)
-                        .WithOne()
-                        .HasForeignKey<Word>(w => w.AntonymId)
+                        .WithMany()
+                        .HasForeignKey(w => w.AntonymId)
                         .OnDelete(DeleteBehavior.SetNull);
                 })
                 .Add<Definition>(builder =>

src/SIL.Harmony.Tests/DbContextTests.VerifyModel.verified.txt

@@ -202,10 +202,10 @@
     Keys: 
       Id PK
     Foreign keys: 
-      Word {'AntonymId'} -> Word {'Id'} Unique SetNull ToPrincipal: Antonym
+      Word {'AntonymId'} -> Word {'Id'} SetNull ToPrincipal: Antonym
       Word {'SnapshotId'} -> ObjectSnapshot {'Id'} Unique SetNull
     Indexes: 
-      AntonymId Unique
+      AntonymId
       SnapshotId Unique
     Annotations: 
       DiscriminatorProperty: