change to find system path for dll

Author: luoja

can/interfaces/zlg/zlgcan.py

@@ -316,7 +316,7 @@ class IProperty(Structure):
 class ZCAN(object):
     def __init__(self):
         if platform.system() == "Windows":
-            self.__dll = windll.LoadLibrary("./zlgcan.dll")
+            self.__dll = windll.LoadLibrary("zlgcan")
         else:
             print("No support now!")
         if self.__dll == None: