fix(spoof): propagate read errors out of mergedContents

A read failure (partial-write race during user edit, SELinux
denial, or any other IOException) used to fall through the
runCatching and rewrite the file with only the global block,
silently destroying every existing [pkg] override. Drop the
runCatching so the failure bubbles to atomicWrite, where the M3
guard in updateTo logs and returns without applyToProps, leaving
both file and props untouched.

app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt

@@ -146,9 +146,7 @@ object PatchLevelManager {
     private fun mergedContents(target: File, date: String): String {
         val globalBlock = "system=$date\nboot=$date\nvendor=$date\n"
         if (!target.exists()) return globalBlock
-        val tail =
-            runCatching { stripGlobalAssignments(target.readLines()) }.getOrNull()
-                ?: return globalBlock
+        val tail = stripGlobalAssignments(target.readLines())
         if (tail.isEmpty()) return globalBlock
         return globalBlock + tail.joinToString("\n", prefix = "\n", postfix = "\n")
     }