Un-remove getBackendDescriptor

- No point in incorrectly inlining it
 - One useage was replaced by InstancedRenderDispatcher#getDebugString

src/main/java/com/jozufozu/flywheel/FlywheelClient.java

@@ -18,7 +18,7 @@ import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
 public class FlywheelClient {
 
 	public static void clientInit() {
-		CrashReportCallables.registerCrashCallable("Flywheel Backend", () -> Backend.getEngine().getProperName());
+		CrashReportCallables.registerCrashCallable("Flywheel Backend", Backend::getBackendDescriptor);
 
 		OptifineHandler.init();
 		Backend.init();

src/main/java/com/jozufozu/flywheel/backend/Backend.java

@@ -29,6 +29,14 @@ public class Backend {
 		return engine;
 	}
 
+	/**
+	 * Get a string describing the Flywheel backend. When there are eventually multiple backends
+	 * (Meshlet, MDI, GL31 Draw Instanced are planned), this will name which one is in use.
+	 */
+	public static String getBackendDescriptor() {
+		return engine == null ? "" : engine.getProperName();
+	}
+
 	@Nullable
 	public static ProgramSpec getSpec(ResourceLocation name) {
 		return loader.get(name);