Remove unused constructor and destructor

Deleted the AccessibilityManager constructor and destructor as they were empty and unnecessary.

Author: lijy91

src/platform/ohos/accessibility_manager_ohos.cpp

@@ -12,9 +12,6 @@
 
 namespace nativeapi {
 
-AccessibilityManager::AccessibilityManager() : enabled_(false) {}
-AccessibilityManager::~AccessibilityManager() {}
-
 void AccessibilityManager::Enable() {
   enabled_ = true;
 }