fix: Added own SPID filter to sqlserverqueries.go (#12387)

This filter has been set on all other source files (azureSqlDB and azureSqlMI) but not on the on-prem version

plugins/inputs/sqlserver/sqlserverqueries.go

@@ -1134,6 +1134,7 @@ WHERE
 			[is_user_process] = 1
 			OR [status] COLLATE Latin1_General_BIN NOT IN (''background'', ''sleeping'')
 		)
+		AND [session_id] <> @@SPID  --Exclude current SPID
 	)
 OPTION(MAXDOP 1)'