fix backspace behavior
fix backspace behavior

fraywing/quill,quilljs/quill,sferoze/quilljs,willrowe/quill,willrowe/quill,voxmedia/quill,voxmedia/quill,sferoze/quilljs,fraywing/quill,sferoze/quilljs,sferoze/quilljs,quilljs/quill,voxmedia/quill,quilljs/quill,tim-mc/quill,willrowe/quill,tim-mc/quill