Fix popup react error key missing (#261)

## Describe your changes
just fix a missing key on react (error on chrome extension log)
## Issue ticket number and link
none
## Checklist before requesting a review
- [x] I have read and understand the [Contributions
section](https://github.com/tprouvot/Salesforce-Inspector-reloaded#contributions)
- [x] Target branch is releaseCandidate and not master
- [x] I have performed a self-review of my code
- [x] I ran the [unit
tests](https://github.com/tprouvot/Salesforce-Inspector-reloaded#unit-tests)
and my PR does not break any tests
- [ ] I documented the changes I've made on the
[CHANGES.md](https://github.com/tprouvot/Salesforce-Inspector-reloaded/blob/master/CHANGES.md)
and followed actual conventions
- [ ] I added a new section on
[how-to.md](https://github.com/tprouvot/Salesforce-Inspector-reloaded/blob/master/docs/how-to.md)
(optional)

addon/popup.js

@@ -1507,7 +1507,7 @@ class AllDataSelection extends React.PureComponent {
         h(ShowDetailsButton, {ref: "showDetailsBtn", sfHost, showDetailsSupported, selectedValue, contextRecordId}),
         selectedValue.recordId && selectedValue.recordId.startsWith("0Af")
           ? h("a", {href: this.getDeployStatusUrl(), target: linkTarget, className: "button page-button slds-button slds-button_neutral slds-m-top_xx-small slds-m-bottom_xx-small"}, "Check Deploy Status") : null,
-        buttons.map((button, index) => h("div", {}, h("a",
+        buttons.map((button, index) => h("div", {key: button + "Div"}, h("a",
           {
             key: button,
             // If buttons for both APIs are shown, the keyboard shortcut should open the first button.