Remove hardcoded wiki.termux.com url from HelpActivity

Author: agnostic-apollo

app/src/main/java/com/termux/app/activities/HelpActivity.java

@@ -12,6 +12,8 @@
 import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 
+import com.termux.shared.termux.TermuxConstants;
+
 /** Basic embedded browser for viewing help pages. */
 public final class HelpActivity extends Activity {
 
@@ -39,7 +41,7 @@ protected void onCreate(Bundle savedInstanceState) {
         mWebView.setWebViewClient(new WebViewClient() {
             @Override
             public boolean shouldOverrideUrlLoading(WebView view, String url) {
-                if (url.startsWith("https://wiki.termux.com")) {
+                if (url.equals(TermuxConstants.TERMUX_WIKI_URL) || url.startsWith(TermuxConstants.TERMUX_WIKI_URL + "/")) {
                     // Inline help.
                     setContentView(progressLayout);
                     return false;
@@ -60,7 +62,7 @@ public void onPageFinished(WebView view, String url) {
                 setContentView(mWebView);
             }
         });
-        mWebView.loadUrl("https://wiki.termux.com/wiki/Main_Page");
+        mWebView.loadUrl(TermuxConstants.TERMUX_WIKI_URL);
     }
 
     @Override