fix(dialog): use parsed MIME type for Android save dialog (#3519)

.changes/dialog-save-fix.md

@@ -0,0 +1,6 @@
+---
+"dialog": patch
+"dialog-js": patch
+---
+
+Fix Android save dialog MIME type when a single MIME type is provided.

plugins/dialog/android/src/main/java/DialogPlugin.kt

@@ -204,9 +204,10 @@ class DialogPlugin(private val activity: Activity): Plugin(activity) {
       val intent = Intent(Intent.ACTION_CREATE_DOCUMENT)
       intent.addCategory(Intent.CATEGORY_OPENABLE)
       intent.putExtra(Intent.EXTRA_TITLE, args.fileName ?: "")
-      intent.type = "*/*"
-
-      if (parsedTypes.isNotEmpty()) {
+      if (parsedTypes.size == 1) {
+        intent.type = parsedTypes.first()
+      } else {
+        intent.type = "*/*"
         intent.putExtra(Intent.EXTRA_MIME_TYPES, parsedTypes)
       }