Forget about selected result from old search

When selecting a result from the result list and then performing a new search, that result is still remembered as being selected, i.e. hitting enter will open it although it has nothing to do with the new search.
Forget about the selected result when performing a new search.

src/renderer/palette.js

@@ -81,6 +81,7 @@ const makePalette = (searchInput, resultlist) => {
     searchInput.addEventListener('input', () => {
         // clear previous search results
         resultlist.replaceChildren()
+        selectedResult = null
 
         // prepare search
         let term = searchInput.value.trim()