Don't limit mime type to text/* when importing

When exporting a file to a directory that already has a file with the
same name, android adds " (1)" to the filename. If limiting type to
text/* when picking file to import, then it's not possible to select
that file.

android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java

@@ -553,7 +553,7 @@ public class MainActivity extends AppCompatActivity
         else {
             Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
             intent.addCategory(Intent.CATEGORY_OPENABLE);
-            intent.setType("text/*");
+            intent.setType("*/*");
 
             startActivityForResult(
                     Intent.createChooser(intent, getResources().getString(R.string.label_import)),