Fix cursor move with wide glyphs

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st would always move back 1 column,
even with wide glyhps (using more than a single column).

The glyph rune is set on its first column,
and the other ones are to 0,
so loop until we detect the start of the previous glyph.

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Gitea Version: 1.28.0+dev-505-g31b4d79a84