remove no more needed button pngs

diff --git a/lib/python/Plugins/SystemPlugins/SoftwareManager/blue.png b/lib/python/Plugins/SystemPlugins/SoftwareManager/blue.png
deleted file mode 100755 (executable)
index a392bbe..0000000
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diff --git a/lib/python/Plugins/SystemPlugins/SoftwareManager/green.png b/lib/python/Plugins/SystemPlugins/SoftwareManager/green.png
deleted file mode 100755 (executable)
index f168e4d..0000000
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diff --git a/lib/python/Plugins/SystemPlugins/SoftwareManager/red.png b/lib/python/Plugins/SystemPlugins/SoftwareManager/red.png
deleted file mode 100755 (executable)
index 8096045..0000000
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diff --git a/lib/python/Plugins/SystemPlugins/SoftwareManager/yellow.png b/lib/python/Plugins/SystemPlugins/SoftwareManager/yellow.png
deleted file mode 100755 (executable)
index dacb80e..0000000
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