call setDecorFitsSystemWindows before setContentView

https://developer.android.com/develop/ui/views/layout/edge-to-edge
https://developer.android.com/develop/ui/views/layout/edge-to-edge-manually

Author: octocorvus

app/src/main/java/app/grapheneos/pdfviewer/PdfViewer.java

@@ -279,6 +279,7 @@ private void showWebViewCrashed() {
     @SuppressLint({"SetJavaScriptEnabled"})
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
 
         binding = PdfviewerBinding.inflate(getLayoutInflater());
         setContentView(binding.getRoot());
@@ -304,8 +305,6 @@ protected void onCreate(Bundle savedInstanceState) {
             }
         });
 
-        WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
-
         // Margins for the toolbar are needed, so that content of the toolbar
         // is not covered by a system button navigation bar when in landscape.
         KtUtilsKt.applySystemBarMargins(binding.toolbar, false);