Define yabridge Window class name in header

Apparently this is used in xdnd-proxy.cpp.

src/wine-host/editor.cpp

@@ -41,12 +41,6 @@ using namespace std::literals::string_literals;
         }                                                               \
     } while (0)
 
-/**
- * The name of the Win32 window class we'll use for the Win32 window that the
- * plugin can embed itself in.
- */
-constexpr char yabridge_window_class_name[] = "yabridge plugin";
-
 /**
  * The Win32 timer ID we'll use to periodically call the VST2 `effeditidle`
  * function with. We have to do this on a timer because the function has to be

src/wine-host/editor.h

@@ -48,6 +48,12 @@ constexpr uint8_t xcb_event_type_mask = 0b0111'1111;
  */
 constexpr char xdnd_aware_property_name[] = "XdndAware";
 
+/**
+ * The name of the Win32 window class we'll use for the Win32 window that the
+ * plugin can embed itself in.
+ */
+constexpr char yabridge_window_class_name[] = "yabridge plugin";
+
 /**
  * Get the atom with the specified name. May throw when
  * `xcb_intern_atom_reply()` returns an error. Returns `XCB_ATOM_NONE` when the