remove unnecessary changes

Author: Afsalmc

src/Microsoft.OpenApi/Extensions/OpenApiTypeMapper.cs

@@ -22,7 +22,7 @@ public static class OpenApiTypeMapper
             [typeof(ulong)] = () => new OpenApiSchema { Type = "integer", Format = "int64" },
             [typeof(float)] = () => new OpenApiSchema { Type = "number", Format = "float" },
             [typeof(double)] = () => new OpenApiSchema { Type = "number", Format = "double" },
-            [typeof(decimal)] = () => new OpenApiSchema { Type = "number", Format = "double" },
+            [typeof(decimal)] = () => new OpenApiSchema { Type = "number", Format = "decimal" },
             [typeof(DateTime)] = () => new OpenApiSchema { Type = "string", Format = "date-time" },
             [typeof(DateTimeOffset)] = () => new OpenApiSchema { Type = "string", Format = "date-time" },
             [typeof(Guid)] = () => new OpenApiSchema { Type = "string", Format = "uuid" },
@@ -36,8 +36,8 @@ public static class OpenApiTypeMapper
             [typeof(long?)] = () => new OpenApiSchema { Type = "integer", Format = "int64", Nullable = true },
             [typeof(ulong?)] = () => new OpenApiSchema { Type = "integer", Format = "int64", Nullable = true },
             [typeof(float?)] = () => new OpenApiSchema { Type = "number", Format = "float", Nullable = true },
+            [typeof(decimal?)] = () => new OpenApiSchema { Type = "number", Format = "decimal", Nullable = true },
             [typeof(double?)] = () => new OpenApiSchema { Type = "number", Format = "double", Nullable = true },
-            [typeof(decimal?)] = () => new OpenApiSchema { Type = "number", Format = "double", Nullable = true },
             [typeof(DateTime?)] = () => new OpenApiSchema { Type = "string", Format = "date-time", Nullable = true },
             [typeof(DateTimeOffset?)] = () => new OpenApiSchema { Type = "string", Format = "date-time", Nullable = true },
             [typeof(Guid?)] = () => new OpenApiSchema { Type = "string", Format = "uuid", Nullable = true },