hwcomposer/interfaces: Fix building on A14+

[supechicken]

Fixes the following errors:

prebuilts/clang/host/linux-x86/clang-r547379/include/c++/v1/__memory/allocator.h:79:17: error: static assertion failed due to requirement '!is_const<const std::string>::value': std::allocator does not support const types
   79 |   static_assert(!is_const<_Tp>::value, "std::allocator does not support const types");
      |                 ^~~~~~~~~~~~~~~~~~~~~
prebuilts/clang/host/linux-x86/clang-r547379/include/c++/v1/__memory/allocator_traits.h:248:39: note: in instantiation of template class 'std::allocator<const std::string>' requested here
  248 |   using value_type         = typename allocator_type::value_type;
      |                                       ^
prebuilts/clang/host/linux-x86/clang-r547379/include/c++/v1/vector:399:20: note: in instantiation of template class 'std::allocator_traits<std::allocator<const std::string>>' requested here
  399 |   typedef typename __alloc_traits::size_type size_type;
      |                    ^
hardware/waydroid/hwcomposer/WaydroidClipboard.cpp:30:45: note: in instantiation of template class 'std::vector<const std::string>' requested here
   30 | static const std::vector<const std::string> MIME_TYPES = {

hardware/waydroid/interfaces/task/1.0/default/WaydroidTask.cpp:72:56: error: 'string' is a private member of 'android::String8'
   72 |     const char* OutAppName = android::String8(AppName).string();
      |                                                        ^

[gemini-code-assist]

Code Review

This pull request updates WaydroidClipboard.cpp to remove const from std::vector elements and modifies WaydroidTask.cpp to support Android API level 34. A critical issue was identified in WaydroidTask.cpp where the use of a temporary String8 object results in a use-after-free vulnerability. Additionally, the fallback logic for empty application names was inadvertently omitted for the new API branch.