emerald/plymouth: Remove major version number, re-centre logo horizontally

We have been in the Debian 13 cycle for more than a year now, so it seems
inappropriate to identify testing/unstable installations as Debian 12.

Helps: #1038660
Signed-off-by: Simon McVittie <smcv@debian.org>

emerald-theme/source/plymouth/debian_bulleyes_plymouth_bg.svg

@@ -90,7 +90,7 @@
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-	<g id="Debian_Logo">
+	<g id="Debian_Logo" transform="translate(34.9)">
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@@ -150,16 +150,6 @@
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