Stop quake mode from forcing focus mode (#10150)

Now it just launches in focus mode, but you can _leave_ focus mode just fine.

I can't iterate on this more today - VS decided that it _needed_ an update ☹️ 

* [x] I work here
* [x] Is polish
* [x] @cinnamon-msft: We'll need to update the docs to reflect this.

see also: #8888, comments in that thread

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -2071,9 +2071,7 @@ namespace winrt::TerminalApp::implementation
 
     void TerminalPage::_SetFocusMode(const bool inFocusMode)
     {
-        // If we're the quake window, we must always be in focus mode.
-        // Prevent leaving focus mode here.
-        const bool newInFocusMode = inFocusMode || IsQuakeWindow();
+        const bool newInFocusMode = inFocusMode;
         if (newInFocusMode != FocusMode())
         {
             _isInFocusMode = newInFocusMode;