Clear Terminal's reference to custom key event handler

package.json

@@ -49,7 +49,7 @@
     "vscode-nsfw": "1.0.17",
     "vscode-ripgrep": "^1.0.1",
     "vscode-textmate": "^4.0.0-next.2",
-    "vscode-xterm": "3.5.0-beta16",
+    "vscode-xterm": "3.5.0-beta17",
     "yauzl": "^2.9.1"
   },
   "devDependencies": {

yarn.lock

@@ -6253,9 +6253,9 @@ vscode-textmate@^4.0.0-next.2:
     fast-plist "^0.1.2"
     oniguruma "^7.0.0"
 
-vscode-xterm@3.5.0-beta16:
-  version "3.5.0-beta16"
-  resolved "https://registry.yarnpkg.com/vscode-xterm/-/vscode-xterm-3.5.0-beta16.tgz#22e96fd791b408751bf2c6973219fc994a63cb70"
+vscode-xterm@3.5.0-beta17:
+  version "3.5.0-beta17"
+  resolved "https://registry.yarnpkg.com/vscode-xterm/-/vscode-xterm-3.5.0-beta17.tgz#9a7dd13cdd9a45257aacb815501f71ed788c2e48"
 
 vso-node-api@^6.1.2-preview:
   version "6.1.2-preview"