Respect the SDL_BORDERLESS_RESIZABLE_STYLE hint, but default it to true.

src/video/windows/SDL_windowswindow.c

@@ -143,6 +143,7 @@ static ATOM SDL_HelperWindowClass = 0;
 
 /* For borderless Windows, still want the following flag:
    - WS_MINIMIZEBOX: window will respond to Windows minimize commands sent to all windows, such as windows key + m, shaking title bar, etc.
+   - WS_MAXIMIZEBOX: window will respond to Windows maximize commands sent to all windows, and the window will fill the usable desktop area rather than the whole screen
    Additionally, non-fullscreen windows can add:
    - WS_CAPTION: this seems to enable the Windows minimize animation
    - WS_SYSMENU: enables system context menu on task bar
@@ -152,8 +153,8 @@ static ATOM SDL_HelperWindowClass = 0;
 
 #define STYLE_BASIC               (WS_CLIPSIBLINGS | WS_CLIPCHILDREN)
 #define STYLE_FULLSCREEN          (WS_POPUP | WS_MINIMIZEBOX)
-#define STYLE_BORDERLESS          (WS_POPUP | WS_MINIMIZEBOX | WS_THICKFRAME)
-#define STYLE_BORDERLESS_WINDOWED (WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_THICKFRAME)
+#define STYLE_BORDERLESS          (WS_POPUP | WS_MINIMIZEBOX)
+#define STYLE_BORDERLESS_WINDOWED (WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
 #define STYLE_NORMAL              (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
 #define STYLE_RESIZABLE           (WS_THICKFRAME | WS_MAXIMIZEBOX)
 #define STYLE_MASK                (STYLE_FULLSCREEN | STYLE_BORDERLESS | STYLE_NORMAL | STYLE_RESIZABLE)
@@ -189,7 +190,7 @@ static DWORD GetWindowStyle(SDL_Window *window)
                see https://bugzilla.libsdl.org/show_bug.cgi?id=4466
              */
             if (!(window->flags & SDL_WINDOW_BORDERLESS) ||
-                SDL_GetHintBoolean("SDL_BORDERLESS_RESIZABLE_STYLE", false)) {
+                SDL_GetHintBoolean("SDL_BORDERLESS_RESIZABLE_STYLE", true)) {
                 style |= STYLE_RESIZABLE;
             } else if (window->flags & SDL_WINDOW_BORDERLESS) {
                 /* Even if the resizable style hint isn't set, WS_MAXIMIZEBOX is still needed, or