Explicitly specify enum type scope to improve Java wrapper generation

Changed PatternPositionType to aruco::PatternPositionType to explicitly specify its scope.
This allows gen_java.py to correctly register disc_type, preventing constructors and
methods using this enum type from being skipped during Java wrapper generation.

Author: utibenkei

modules/aruco/include/opencv2/aruco/aruco_calib.hpp

@@ -53,7 +53,7 @@ enum PatternPositionType {
  * @sa PatternPositionType, solvePnP()
  */
 struct CV_EXPORTS_W_SIMPLE EstimateParameters {
-    CV_PROP_RW PatternPositionType pattern;
+    CV_PROP_RW aruco::PatternPositionType pattern;
     CV_PROP_RW bool useExtrinsicGuess;
     CV_PROP_RW int solvePnPMethod;