fix: resolve the cores handhelds rename

ArkOS ran the GBA with gpsp_ezode_mod and dArkOS with mgba_rumble: no
profile named them, so an install for the card's games kept every GBA
core's files, FBNeo's 3,472 data files among them. Each rename proven
from the OS build (same code base, same BIOS loading) joins its
profile's cores. The resolver folds either separator, and falls back to
the emulator column when the core names a mode, a machine or a plugin
of that program, only where its profile declares the folder's system:
MAME documents no GameKing ROM. 109 unresolved names are 56, each one
recorded with why in tests/test_games_index.py.

scripts/romfolders.py

@@ -172,7 +172,10 @@ class ProfileResolver:
             return None
         # RetroPie names a libretro package lr-<core> (scriptmodules/libretrocores).
         bare = core.removeprefix("lr-")
-        spellings = (core, core.lower(), bare, bare.replace("-", "_"), bare.lower().replace("-", "_"))
+        # Either separator in either direction: plumOS names flycast_xtreme
+        # the core flycast2021 lists as flycast-xtreme.
+        spellings = (core, core.lower(), bare, bare.replace("-", "_"), bare.lower().replace("-", "_"),
+                     bare.replace("_", "-"), bare.lower().replace("_", "-"))
         for name in dict.fromkeys(spellings):
             found = preferred_profile(self.index, name)
             if found: