chore: small cmake cleanup

lib/platform: use the REQUIRED_QT_VERSION when looking for Qt Dbus module
  lib/deskflow: rm extra space in cmake file

src/lib/deskflow/CMakeLists.txt

@@ -67,7 +67,7 @@ elseif(UNIX)
   )
 endif()
 
-add_library(${lib_name} STATIC  ${PLATFORM_CODE}
+add_library(${lib_name} STATIC ${PLATFORM_CODE}
   App.cpp
   App.h
   AppUtil.cpp

src/lib/platform/CMakeLists.txt

@@ -183,7 +183,7 @@ if(UNIX)
     ${libs})
 
   if(NOT APPLE)
-    find_package(Qt6 COMPONENTS DBus)
+    find_package(Qt6 ${REQUIRED_QT_VERSION} REQUIRED COMPONENTS DBus)
     target_link_libraries(platform Qt6::DBus)
 
     link_wayland_libs()