code cleanup

src/runner.js

@@ -88,28 +88,16 @@ async function healPrefixOnce(game) {
   }
 }
 
-// Proton's STEAM_COMPAT_DATA_PATH must be a symlink to the launcher prefix.
-// A leftover EMPTY compat dir (an older PLWL bug) is replaced by the link; a
-// populated one is left alone.
+// Proton's STEAM_COMPAT_DATA_PATH must be a symlink to the launcher prefix;
+// a real compat dir already sitting there is not ours to replace.
 function linkPrefix(compatData, prefixDir) {
   try {
     fs.mkdirSync(path.dirname(compatData), { recursive: true })
   } catch {}
   try {
-    const st = fs.lstatSync(compatData)
-    if (st.isSymbolicLink()) {
-      if (fs.readlinkSync(compatData) === prefixDir) return
-      fs.unlinkSync(compatData)
-    } else if (st.isDirectory()) {
-      let names = []
-      try {
-        names = fs.readdirSync(compatData)
-      } catch {}
-      if (names.length) return
-      fs.rmdirSync(compatData)
-    } else {
-      return
-    }
+    if (!fs.lstatSync(compatData).isSymbolicLink()) return
+    if (fs.readlinkSync(compatData) === prefixDir) return
+    fs.unlinkSync(compatData)
   } catch {}
   try {
     fs.symlinkSync(prefixDir, compatData, 'dir')