chore(android): improve error message when Filesystem.copy fails (#3148)

Author: asztal

android/capacitor/src/main/java/com/getcapacitor/plugin/Filesystem.java

@@ -579,23 +579,22 @@ private void _copy(PluginCall call, boolean doRename) {
     toObject.delete();
 
     assert fromObject != null;
-    boolean modified = false;
 
     if (doRename) {
-      modified = fromObject.renameTo(toObject);
+      boolean modified = fromObject.renameTo(toObject);
+      if (!modified) {
+        call.error("Unable to rename, unknown reason");
+        return;
+      }
     } else {
       try {
         copyRecursively(fromObject, toObject);
-        modified = true;
-      } catch (IOException ignored) {
+      } catch (IOException e) {
+        call.error("Unable to perform action: " + e.getLocalizedMessage());
+        return;
       }
     }
 
-    if (!modified) {
-      call.error("Unable to perform action, unknown reason");
-      return;
-    }
-
     call.success();
   }