[CALC] Use CW_USEDEFAULT16 for Dialog X (#5621)

- Use CW_USEDEFAULT16 (0x8000) for the X coordinate of IDD_DIALOG_SCIENTIFIC,
  IDD_DIALOG_STANDARD, and IDD_DIALOG_CONVERSION dialogs.
https://stackoverflow.com/a/76201122/4381493
BEFORE:
e16ce819-05a9-483a-aacb-b93caaacff5a
The starting position wouldn't change from upper left corner (0, 0) of the screen.
AFTER:
569ae41b-b545-4eb0-8848-d25dbc5d4699
The starting position is changing.
CORE-19141

base/applications/calc/resource.h

@@ -4,6 +4,8 @@
 #define IDC_STATIC  -1
 #endif
 
+#define CW_USEDEFAULT16 0x8000
+
 #define IDS_CALC_NAME                   1
 #define IDS_MATH_ERROR                  2
 #define IDS_QUICKHELP                   3