Fix missing action buttons in RTF Scan's Verify Cited Items table

The action column's width was given as "32px", which VirtualizedTable
now turns into an invalid CSS width, collapsing the column and hiding
the buttons needed to resolve unmapped and ambiguous citations. Also
restore the accept-match icon on ambiguous-citation candidates.

https://forums.zotero.org/discussion/133740/

(cherry picked from commit 0d0bbc8925)

chrome/content/zotero/rtfScan.js

@@ -13,7 +13,7 @@ Services.scriptloader.loadSubScript('chrome://zotero/content/elements/styleConfi
 const columns = [
 	{ dataKey: 'rtf', label: "zotero.rtfScan.citation.label", primary: true, flex: 4 },
 	{ dataKey: 'item', label: "zotero.rtfScan.itemName.label", flex: 5 },
-	{ dataKey: 'action', label: "", fixedWidth: true, width: "32px" },
+	{ dataKey: 'action', label: "", fixedWidth: true, width: 32 },
 ];
 
 const initialRows = [
@@ -339,7 +339,7 @@ const Zotero_RTFScan = { // eslint-disable-line no-unused-vars, camelcase
 					row = { ...row, parent: ambiguousRow };
 					this.insertRows(row, this.rowMap.mapped);
 					this.insertRows(
-						items.map(item => ({ rtf: '', item: item.getField('title'), parent: row })),
+						items.map(item => ({ rtf: '', item: item.getField('title'), action: true, parent: row })),
 						this.rowMap[row.id] + 1
 					);
 					this.citationItemIDs[row.rtf] = items.map(item => item.id);