fix: remove dconfig_meta_files for DTK5

The condition for installing DtkDConfigMacros.cmake was inverted.
Previously, the deprecated dconfig_meta_files function was being removed
only when NOT building for DTK5, which is incorrect. The function
should be removed specifically for DTK5 builds as it is deprecated
since dtk6. The change corrects the condition to `if (DTK5)` to ensure
the deprecated function is properly excluded in DTK5 builds while being
available for dtk6.

Influence:
1. Verify that DtkDConfigMacros.cmake installs correctly for both DTK5
and non-DTK5 builds.
2. Test that the dconfig_meta_files function is not available when
building with DTK5.
3. Confirm that the macro file works as expected for dtk6 builds.

fix: 修复 DTK5 构建中 dconfig_meta_files 的移除逻辑

安装 DtkDConfigMacros.cmake 的条件被错误地反转了。之前，只有在非 DTK5
构建时才会移除已弃用的 dconfig_meta_files 函数，这是不正确的。该函数
自 dtk6 起已弃用，应专门在 DTK5 构建中移除。此次更改将条件修正为 `if
(DTK5)`，以确保在 DTK5 构建中正确排除已弃用的函数，同时使其在 dtk6 构建
中可用。

Influence:
1. 验证 DtkDConfigMacros.cmake 在 DTK5 和非 DTK5 构建中是否正确安装。
2. 测试在构建 DTK5 时 dconfig_meta_files 函数是否不可用。
3. 确认该宏文件在 dtk6 构建中按预期工作。

Author: 18202781743

dtkcore.cmake

@@ -94,7 +94,7 @@ install(FILES cmake/DtkTools/DtkDBusMacros.cmake
 install(FILES ${CMAKE_SOURCE_DIR}/cmake/DtkTools/DtkDConfigMacros.cmake
         DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Dtk${DTK_NAME_SUFFIX}Tools")
 
-if (NOT DTK5)
+if (DTK5)
     set(DCONFIG_DEPRECATED_FUNCS [=[
 # deprecated since dtk6
 function(dconfig_meta_files)