allow user delete if they are not the only owner

src/Sql/Sql.sqlproj

@@ -114,7 +114,7 @@
     <Build Include="dbo\Stored Procedures\OrganizationUser_ReadCountByFreeOrganizationAdminUser.sql" />
     <Build Include="dbo\Stored Procedures\User_ReadAccountRevisionDateById.sql" />
     <Build Include="dbo\Stored Procedures\OrganizationUser_ReadCountByOrganizationId.sql" />
-    <Build Include="dbo\Stored Procedures\OrganizationUser_ReadCountByOrganizationOwnerUser.sql" />
+    <Build Include="dbo\Stored Procedures\OrganizationUser_ReadCountByOnlyOwner.sql" />
     <Build Include="dbo\Stored Procedures\OrganizationUser_Update.sql" />
     <Build Include="dbo\Stored Procedures\OrganizationUserOrganizationDetails_ReadByUserIdStatus.sql" />
     <Build Include="dbo\Stored Procedures\OrganizationUserUserDetails_ReadByOrganizationId.sql" />

src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOnlyOwner.sql

@@ -0,0 +1,25 @@
+CREATE PROCEDURE [dbo].[OrganizationUser_ReadCountByOnlyOwner]
+    @UserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    ;WITH [OwnerCountCTE] AS
+    (
+        SELECT
+            OU.[UserId],
+            COUNT(1) OVER (PARTITION BY OU.[OrganizationId]) [ConfirmedOwnerCount]
+        FROM
+            [dbo].[OrganizationUser] OU
+        WHERE
+            OU.[Type] = 0 -- 0 = Owner
+            AND OU.[Status] = 2 -- 2 = Confirmed
+    )
+    SELECT
+        COUNT(1)
+    FROM
+        [OwnerCountCTE] OC
+    WHERE
+        OC.[UserId] = @UserId
+        AND OC.[ConfirmedOwnerCount] = 1
+END

src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOrganizationOwnerUser.sql

@@ -1,15 +0,0 @@
-CREATE PROCEDURE [dbo].[OrganizationUser_ReadCountByOrganizationOwnerUser]
-    @UserId UNIQUEIDENTIFIER
-AS
-BEGIN
-    SET NOCOUNT ON
-
-    SELECT
-        COUNT(1)
-    FROM
-        [dbo].[OrganizationUser] OU
-    WHERE
-        OU.[UserId] = @UserId
-        AND OU.[Type] = 0
-        AND OU.[Status] = 2 -- 2 = Confirmed
-END

src/Sql/dbo/Stored Procedures/User_DeleteById.sql

@@ -64,7 +64,6 @@ BEGIN
         [dbo].[OrganizationUser]
     WHERE
         [UserId] = @Id
-        AND [Type] != 0 -- 0 = owner
 
     -- Finally, delete the user
     DELETE