stb_textedit: set cursor to start of line when pressing up in the first line #1693
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Previously, when pressing the up key while the cursor is positioned in the first line, nothing happens because there is a break when no previous line exists, causing the event handling to exit.
Many texteditors move the cursor to the start of the line when pressing up in this case, similar to how it's already implemented when pressing down on the last line of the text, where the cursor gets set to the end.