web-install: Rethrow errors after handling

After handling errors and showing them to the user, we can rethrow them
to make them show up in the console. This helps greatly with debugging.

static/js/web-install.js

@@ -180,6 +180,8 @@ function addButtonHook(id, callback) {
         } catch (error) {
             statusCallback(`Error: ${error.message}`);
             statusField.className = "error-text";
+            // Rethrow the error so it shows up in the console
+            throw error;
         }
     };
 }