fix(test): remove extra comma in json

Author: cnblogs-dudu

src/IdentityServer4/test/IdentityServer.UnitTests/Extensions/IdentityServerBuilderExtensionsCryptoTests.cs

@@ -36,7 +36,7 @@ public void AddSigningCredential_with_json_web_key_containing_asymmetric_key_sho
                 ""q"" : ""yDKBrS8l1DOx4dwP9hdwhqZJ3XahidiIZSL7m46I/6+cjaki/1mtNiA60MOgqTKegP7Fo7jAYvliqQwnvVGmQvLv19cfKywlIuKN9DdkLHnKh75hfo7aakEbO7GJ5zVgsNnKOdf8wvpclfvIuRDEVva4cksPzsJy6K7C8ENCSCM="",
                 ""dp"" :  ""GlYJ6o6wgawxCEQ5z5uWwETau5CS/Fk7kI2ceI14SZVHzlJQC2WglAcnQcqhmQCk57Xsy5iLM6vKyi8sdMJPh+nvR2HlyNA+w7YBy4L7odqn01VmLgv7zVVjZpNq4ZXEoDC1Q+xjtF1LoYaUt7wsRLp+a7znuPyHBXj1sAAeBwk="",
                 ""dq"" :  ""W8OK3S83T8VCTBzq1Ap6cb3XLcQq11yBaJpYaj0zXr/IKsbUW+dnFeBAFWEWS3gAX3Bod1tAFB3rs0D3FjhO1XE1ruHUT520iAEAwGiDaj+JLh994NzqELo3GW2PoIM/BtFNeKYgHd9UgQsgPnQJCzOb6Aev/z3yHeW9RRQPVbE="",
-                ""qi"" :  ""w4KdmiDN1GtK71JxaasqmEKPNfV3v2KZDXKnfyhUsdx/idKbdTVjvMOkxFPJ4FqV4yIVn06f3QHTm4NEG18Diqxsrzd6kXQIHOa858tLsCcmt9FoGfrgCFgVceh3K/Zah/r8rl9Y61u0Z1kZumwMvFpFE+mVU01t9HgTEAVkHTc="",
+                ""qi"" :  ""w4KdmiDN1GtK71JxaasqmEKPNfV3v2KZDXKnfyhUsdx/idKbdTVjvMOkxFPJ4FqV4yIVn06f3QHTm4NEG18Diqxsrzd6kXQIHOa858tLsCcmt9FoGfrgCFgVceh3K/Zah/r8rl9Y61u0Z1kZumwMvFpFE+mVU01t9HgTEAVkHTc=""
             }";
 
             var jsonWebKey = new JsonWebKey(json);