embeddings: fix extraction of CLS pooling results (#14927) #8

Job	Run time
macOS-x64	8m 35s
macOS-arm64	2m 39s
windows-hip (radeon, gfx1100;gfx1101;gfx1102;gfx1030;gfx1031;gfx1032)	52m 33s
windows-sycl	10m 48s
ubuntu-22-vulkan	7m 19s
ubuntu-22-cpu (x64, ubuntu-22.04)	3m 33s
windows-cpu (arm64)	3m 10s
windows-cuda (12.4)	41m 20s
windows-cpu (x64)	4m 13s
ios-xcode-build	11m 35s
windows (opencl-adreno, arm64, -G "Ninja Multi-Config" -D CMAKE_TOOLCHAIN_FILE=cmake/arm64-window...	2m 28s
windows (vulkan, x64, -DGGML_VULKAN=ON, ggml-vulkan)	3m 56s
release	1m 48s
	2h 33m 57s

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