sceKernelLoadModule: Resolve a relative path when the load is requested

- Fixes #22578

Since loads became deferred (#22507), the file is read from the event at the
end of the wait, where there is no current thread and so no current
directory. Crash Tag Team Racing loads its PRXs as "prx/sc_sascore.prx" and
so on, got NOCWD for all of them and never started. Make the path absolute
with the caller's current directory before waiting.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Core/HLE/sceKernelModule.cpp

@@ -2733,6 +2733,15 @@ u32 sceKernelLoadModule(const char *name, u32 flags, u32 optionAddr) {
 		const SceUID threadID = __KernelGetCurThread();
 		PendingModuleLoad &load = g_pendingModuleLoads[threadID];
 		load.name = name;
+		// The event loads outside of any thread, so a relative path (Crash Tag Team Racing loads
+		// "prx/sc_sascore.prx") has to be resolved against the caller's current directory now.
+		// modulemgr.prx's sceKernelLoadModule also opens the file in the caller's thread.
+		if (load.name.find(':') == std::string::npos) {
+			const std::string cwd = pspFileSystem.GetCurrentDirForThread(threadID);
+			if (!cwd.empty()) {
+				load.name = cwd + "/" + load.name;
+			}
+		}
 		load.flags = flags;
 		load.hasOption = lmoption != nullptr;
 		if (lmoption) {