Fix Pixel_BackgroundImage Nexus 5 suppression

The test fails on Nexus 5 with SkiaRenderer enabled. When fixing the
tags, so running with SkiaRenderer had the skia-renderer tag, this test
started failing again because the suppression had no-skia-renderer as
the tag. The test fails both with and without SkiaRenderer enabled so
remove the tag.

Bug: 1069551
Change-Id: I9e2016d01c800fe6ba41673648c32fe0095a9eda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212456
Commit-Queue: kylechar <kylechar@chromium.org>
Auto-Submit: kylechar <kylechar@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771230}

content/test/gpu/gpu_tests/test_expectations/pixel_expectations.txt

@@ -116,7 +116,7 @@ crbug.com/868596 [ android android-chromium nvidia ] Pixel_OffscreenCanvasWebGLP
 crbug.com/948141 Pixel_CanvasDisplaySRGBAccelerated2D [ Skip ]
 
 # Fails on Nexus 5, 6 and 6P
-crbug.com/883500 [ android no-skia-renderer qualcomm-adreno-(tm)-330 ] Pixel_BackgroundImage [ Skip ]
+crbug.com/883500 [ android qualcomm-adreno-(tm)-330 ] Pixel_BackgroundImage [ Skip ]
 crbug.com/883500 [ android no-use-gl no-use-vulkan qualcomm-adreno-(tm)-420 ] Pixel_BackgroundImage [ Skip ]
 crbug.com/883500 [ android no-use-gl no-use-vulkan qualcomm-adreno-(tm)-430 ] Pixel_BackgroundImage [ Skip ]
 crbug.com/1029389 [ android qualcomm-adreno-(tm)-330 ] Pixel_PrecisionRoundedCorner [ Skip ]