chore: remove qt6-multimedia-dev build dependency

Removed qt6-multimedia-dev | libdtkmultimedia-dev from Build-Depends
list as it's no longer needed for the build process. Also fixed
a trailing whitespace issue with libunwind-dev entry for cleaner
formatting.

The multimedia library dependency appears to have been made redundant
by recent code changes, simplifying the build requirements without
affecting core functionality.

Influence:
1. Verify that the application still builds successfully without the
multimedia dependency
2. Test core application functionality to ensure no regression from
dependency removal
3. Check that multimedia-related features (if any) still work as
expected
4. Validate build process on clean environments without qtmultimedia
packages

chore: 移除 qt6-multimedia-dev 构建依赖

从 Build-Depends 列表中移除了 qt6-multimedia-dev | libdtkmultimedia-
dev，因为构建过程不再需要此依赖。同时修复了 libunwind-dev 条目的尾部空格
问题，使格式更整洁。

多媒体库依赖似乎因最近的代码更改而变得冗余，简化了构建要求而不影响核心
功能。

Influence:
1. 验证应用程序在没有多媒体依赖的情况下仍能成功构建
2. 测试核心应用程序功能，确保依赖移除不会导致回归问题
3. 检查多媒体相关功能（如果有）是否仍按预期工作
4. 在没有 qtmultimedia 包的干净环境中验证构建过程

Author: Kakueeen

debian/control

@@ -10,7 +10,6 @@ Build-Depends:
  qt6-tools-dev-tools | qttools5-dev-tools,
  qt6-tools-dev | qttools5-dev,
  qt6-webengine-dev | qtwebengine5-dev,
- qt6-multimedia-dev | libdtkmultimedia-dev,
  libdtk6widget-dev | libdtkwidget-dev,
  libdtk6gui-dev | libdtkgui-dev,
  libdtk6core-dev | libdtkcore-dev,
@@ -34,7 +33,7 @@ Build-Depends:
  libjson-c-dev,
  libelf-dev,
  libcapstone-dev,
- libunwind-dev, 
+ libunwind-dev,
  libelfin-dev,
  libdbus-1-dev,
  libxi-dev,