fix(zigbee): Add default destructor and fix initialization of tm struct (#10943)

Author: P-R-O-C-H-Y

libraries/Zigbee/src/ZigbeeEP.h

@@ -95,7 +95,7 @@ class ZigbeeEP {
   void reportBatteryPercentage();
 
   // Set time
-  void addTimeCluster(tm time = {0}, int32_t gmt_offset = 0);  // gmt offset in seconds
+  void addTimeCluster(tm time = {}, int32_t gmt_offset = 0);  // gmt offset in seconds
   void setTime(tm time);
   void setTimezone(int32_t gmt_offset);
 

libraries/Zigbee/src/ep/ZigbeeWindowCovering.h

@@ -67,7 +67,7 @@ typedef struct zigbee_window_covering_cfg_s {
 class ZigbeeWindowCovering : public ZigbeeEP {
 public:
   ZigbeeWindowCovering(uint8_t endpoint);
-  ~ZigbeeWindowCovering();
+  ~ZigbeeWindowCovering() {}
 
   // Set the callback functions for the window covering commands
   void onOpen(void (*callback)()) {