Stop launching an external console window for VSCode

This change makes it such that the debugged process now runs in a tab
instead of an external window. This is needed because VSCode-in-WSL
cannot launch an external console window, which breaks the experience
completely.

src/main/twirl/com/omegaup/libinteractive/templates/vscode_launch.scala.code

@@ -30,7 +30,6 @@
             "name": "libinteractive console runner",
             "type": "cppdbg",
             "request": "launch",
-            "externalConsole": true,
             "stopAtEntry": false,
             "program": "${workspaceFolder}/@runPath",
             "args": ["--debug"],
@@ -49,7 +48,6 @@
             "name": "libinteractive example runner",
             "type": "cppdbg",
             "request": "launch",
-            "externalConsole": true,
             "stopAtEntry": false,
             "program": "${workspaceFolder}/@runPath",
             "args": ["--debug", "${workspaceFolder}/examples/sample.in"],