`C-g` from `lsp-ui-doc-glance` clobbers next show

[Lenbok]

Prerequisites:

• lsp-ui-doc-childframe (or probably lsp-ui-doc-webkit, untested) should be t. (Doesn't affect inline, but only due to lsp-ui-doc-glance auto-hide is not triggering #695.)
• may not be noticed if using mouse or cursor hover

To reproduce:

1. execute 'lsp-ui-doc-glance`
2. C-g (which closes the doc window)
3. move around, etc move to new function location
4. invoke either lsp-ui-doc-show or lsp-ui-doc-glance
5. notice the document does not show, or maybe flashes.