Revert "Fix nesting level counting for older PG version"

This reverts commit 3e91da8.

pg_stat_monitor.c

@@ -1233,8 +1233,6 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 		 * To be absolutely certain we don't mess up the nesting level,
 		 * evaluate the bump_level condition just once.
 		 */
-
-#if PG_VERSION_NUM >= 17000
 		bool		bump_level =
 			!IsA(parsetree, ExecuteStmt) &&
 			!IsA(parsetree, PrepareStmt) &&
@@ -1245,8 +1243,6 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 
 		PG_TRY();
 		{
-#endif
-
 #if PG_VERSION_NUM >= 140000
 			if (prev_ProcessUtility)
 				prev_ProcessUtility(pstmt, queryString,
@@ -1283,8 +1279,6 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 										dest,
 										completionTag);
 #endif
-
-#if PG_VERSION_NUM >= 17000
 			if (bump_level)
 				nesting_level--;
 		}
@@ -1296,7 +1290,6 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 		}
 		PG_END_TRY();
 	}
-#endif
 }
 
 #if PG_VERSION_NUM < 130000