Guard against possible leak pre android-24

From Android Studio lint:

On versions prior to Android N (24), initializing the WifiManager via
Context#getSystemService can cause a memory leak if the context is not
the application context.
In many cases, it's not obvious from the code where the Context is coming
from (e.g. it might be a parameter to a method, or a field initialized
from various method calls). It's possible that the context being passed in
is the application context, but to be on the safe side, you should consider
changing context.getSystemService(...) to
context.getApplicationContext().getSystemService(...).

app/src/main/java/com/termux/api/WifiAPI.java

@@ -21,7 +21,7 @@ static void onReceiveWifiConnectionInfo(TermuxApiReceiver apiReceiver, final Con
         ResultReturner.returnData(apiReceiver, intent, new ResultReturner.ResultJsonWriter() {
             @Override
             public void writeJson(JsonWriter out) throws Exception {
-                WifiManager manager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+                WifiManager manager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                 WifiInfo info = manager.getConnectionInfo();
                 out.beginObject();
                 if (info == null) {
@@ -53,7 +53,7 @@ static void onReceiveWifiScanInfo(TermuxApiReceiver apiReceiver, final Context c
         ResultReturner.returnData(apiReceiver, intent, new ResultReturner.ResultJsonWriter() {
             @Override
             public void writeJson(JsonWriter out) throws Exception {
-                WifiManager manager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+                WifiManager manager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                 List<ScanResult> scans = manager.getScanResults();
                 if (scans == null) {
                     out.beginObject().name("API_ERROR").value("Failed getting scan results").endObject();