win32: always show the scrollbars like we do on macOS. Fixes #2717

The hover scrollbars aren't common on Windows, so disable them by default.
They can be reenabled in the advanced settings plugin if needed.

quodlibet/quodlibet/config.py

@@ -14,7 +14,7 @@
 from . import const
 from quodlibet.util.config import Config, Error
 from quodlibet.util import print_d, print_w
-from quodlibet.util import is_osx
+from quodlibet.util import is_osx, is_windows
 from quodlibet.compat import PY2, iteritems, text_type
 
 # Some plugins can be enabled on first install
@@ -216,7 +216,8 @@ def _config_text(text):
         "datecolumn_timestamp_format": "",
 
         # scrollbar does not fade out when inactive
-        "scrollbar_always_visible": "true" if is_osx() else "false",
+        "scrollbar_always_visible":
+            "true" if (is_osx() or is_windows()) else "false",
     },
 
     "rename": {