server: fix files built redundantly (#18474)

tools/server/CMakeLists.txt

@@ -38,14 +38,6 @@ set(TARGET_SRCS
     server-http.h
     server-models.cpp
     server-models.h
-    server-task.cpp
-    server-task.h
-    server-queue.cpp
-    server-queue.h
-    server-common.cpp
-    server-common.h
-    server-context.cpp
-    server-context.h
 )
 set(PUBLIC_ASSETS
     index.html.gz