Add Etherscan-style blockie identicon to address detail page

Show a 48px pixelated blockie (same style as Etherscan) centered
above the wallet title on the address detail page. Uses
ethereum-blockies-base64 which generates a base64 PNG from the
address. Replaces the previously added @metamask/jazzicon.

src/popup/views/addressDetail.js

@@ -18,6 +18,7 @@ const { resolveEnsNames } = require("../../shared/ens");
 const { updateSendBalance, renderSendTokenSelect } = require("./send");
 const { log } = require("../../shared/log");
 const QRCode = require("qrcode");
+const makeBlockie = require("ethereum-blockies-base64");
 
 const EXT_ICON =
     `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
@@ -41,6 +42,14 @@ function show() {
     const ai = state.selectedAddress;
     $("address-title").textContent =
         wallet.name + " \u2014 Address " + (wi + 1) + "." + (ai + 1);
+    const blockieEl = $("address-jazzicon");
+    blockieEl.innerHTML = "";
+    const img = document.createElement("img");
+    img.src = makeBlockie(addr.address);
+    img.width = 48;
+    img.height = 48;
+    img.style.imageRendering = "pixelated";
+    blockieEl.appendChild(img);
     $("address-dot").innerHTML = addressDotHtml(addr.address);
     $("address-full").dataset.full = addr.address;
     $("address-full").textContent = addr.address;