refactor: Remove unnecessary async in systemInfo endpoint

(cherry picked from commit 1cb0fac)

Author: melton-jason

specifyweb/frontend/js_src/lib/components/InitialContext/systemInfo.ts

@@ -28,7 +28,7 @@ let systemInfo: SystemInfo;
 export const fetchContext = load<SystemInfo>(
   '/context/system_info.json',
   'application/json'
-).then(async (data) => {
+).then((data) => {
   systemInfo = data;
 
   return systemInfo;