Accept only CF_HDROP for uri-list mime.

Additional types lead to such problem: some programs, like JetBrains
IDEs, like PyCharm, copy "file://[ip-address]/file" as an URI in
uri-list, that way you can't paste it in the messenger, because it
will make a request to that address and reveal clients IP address.

Telegram/build/prepare/prepare.py

@@ -457,7 +457,7 @@ if customRunCommand:
 stage('patches', """
     git clone https://github.com/desktop-app/patches.git
     cd patches
-    git checkout 8cd00d57c7
+    git checkout e66e768a5f
 """)
 
 stage('msys64', """