This fixes C-M-space for WSL but not for Win32, but I'm not sure ther…

…e's a problem in Win32 quite yet. (#5208)

## Summary of the Pull Request

When conpty is in VT input mode, we pass through all the input we receive. This includes all the other `Action*Dispatch` methods, but missed this one.

## References
* Missed during #4856 
* Discovered during the course of the #4192 review
* #5205 Also investigated part of the issue, but found a different bug.

## PR Checklist
* [x] Doesn't close anything, just related to above things.
* [x] I work here
* [ ] Tests added/passed
* [n/a] Requires documentation to be updated

## Detailed Description of the Pull Request / Additional comments
This will fix the <kbd>ctrl+alt+space</kbd> in the Terminal thing mentioned in #4192, but doesn't actually resolve the root cause of that bug (which is tracked in #5205).

src/terminal/parser/InputStateMachineEngine.cpp

@@ -210,6 +210,11 @@ bool InputStateMachineEngine::_DoControlCharacter(const wchar_t wch, const bool
 // - true iff we successfully dispatched the sequence.
 bool InputStateMachineEngine::ActionExecuteFromEscape(const wchar_t wch)
 {
+    if (_pDispatch->IsVtInputEnabled() && _pfnFlushToInputQueue)
+    {
+        return _pfnFlushToInputQueue();
+    }
+
     return _DoControlCharacter(wch, true);
 }