Use double-storey variant for italic “a”

The single-storey a is indistinguishable from alpha, so using
double-storey one is preferable here.

Part of notofonts#71.

sources/NotoSansMath.glyphspackage/glyphs/asansbolditalic-math.glyph

@@ -5,57 +5,68 @@ layers = (
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+pos = (299,273);
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sources/NotoSansMath.glyphspackage/glyphs/asansitalic-math.glyph

@@ -5,57 +5,68 @@ layers = (
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-pos = (299,268);
+pos = (284,267);
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sources/NotoSansMath.glyphspackage/glyphs/asansitalic-math.ssty1.glyph

@@ -6,57 +6,68 @@ layers = (
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-pos = (329,272);
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+pos = (381,0);
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