fix: Erroneous apostrophe preventing firmware updates

This commit fixes an accidentally-left-in apostrophe that is preventing the firmware updater app from downloading firmware, as it uses the URL the user clicked, which will end with an apostrophe, which makes it not match .zip or .hex.

Author: Maffsie

apps/fwupdate/custom.html

@@ -177,7 +177,7 @@
     releaseFiles.sort().reverse().forEach(function(f) {
       var name = f.substr(f.substr(0,f.length-1).lastIndexOf('/')+1);
       console.log("Found "+name);
-      domFirmwareList.innerHTML += `<li>Release${getDescription(name)}: <a href="${f}'" class="fw-link">${name}</a></li>`;
+      domFirmwareList.innerHTML += `<li>Release${getDescription(name)}: <a href="${f}" class="fw-link">${name}</a></li>`;
       domFirmware.style = "";
     });
     getFilesFromURL("https://www.espruino.com/binaries/travis/master/",regex, function(travisFiles) {