Fix cmake build broken by #6724.

PR #6724 deletes two source files, let's delete them from
CMakeLists.txt.

src/base/CMakeLists.txt

@@ -68,7 +68,6 @@ unicodestrings.h
 )
 
 set(QBT_BASE_SOURCES
-bittorrent/cachestatus.cpp
 bittorrent/infohash.cpp
 bittorrent/magneturi.cpp
 bittorrent/peerinfo.cpp
@@ -78,7 +77,6 @@ bittorrent/private/resumedatasavingmanager.cpp
 bittorrent/private/speedmonitor.cpp
 bittorrent/private/statistics.cpp
 bittorrent/session.cpp
-bittorrent/sessionstatus.cpp
 bittorrent/torrentcreatorthread.cpp
 bittorrent/torrenthandle.cpp
 bittorrent/torrentinfo.cpp