FFTFilter test: switch to power of two input size for unit test

Author: azonenberg

tests/Filters/Filter_FFT.cpp

@@ -2,7 +2,7 @@
 *                                                                                                                      *
 * ngscopeclient                                                                                                        *
 *                                                                                                                      *
-* Copyright (c) 2012-2024 Andrew D. Zonenberg and contributors                                                         *
+* Copyright (c) 2012-2026 Andrew D. Zonenberg and contributors                                                         *
 * All rights reserved.                                                                                                 *
 *                                                                                                                      *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the     *
@@ -74,7 +74,7 @@ TEST_CASE("Filter_FFT")
 	vk::raii::CommandBuffer cmdbuf(std::move(vk::raii::CommandBuffers(*g_vkComputeDevice, bufinfo).front()));
 
 	//Create an empty input waveform
-	const size_t depth = 100000;
+	const size_t depth = 131072;
 	UniformAnalogWaveform ua;
 	ua.m_timescale = 10000;		//100 Gsps
 	ua.m_triggerPhase = 0;