fix(测试跟踪 ): 修复功能用例首页与模块统计不一致

--bug=1009862 --user=王孝刚 功能用例首页与模块统计不一致
https://www.tapd.cn/55049933/s/1097187

backend/src/main/java/io/metersphere/base/mapper/ext/ExtTestCaseMapper.xml

@@ -680,8 +680,10 @@
     </sql>
 
     <select id="countPriority" resultType="io.metersphere.track.response.TrackCountResult">
-        SELECT test_case.priority as groupField,count(id) AS countNumber FROM test_case
+        SELECT test_case.priority as groupField, count(DISTINCT ref_id) AS countNumber
-        WHERE project_id = #{projectId} AND (test_case.status IS NULL OR test_case.status != 'Trash')
+        FROM test_case
+        WHERE project_id = #{projectId}
+          AND (test_case.status IS NULL OR test_case.status != 'Trash')
         GROUP BY test_case.priority
     </select>