patch 8.2.1763: Vim9: cannot use "true" for popup window scrollbar option

Problem:    Vim9: cannot use "true" for popup window scrollbar option.
Solution:   use dict_get_bool(). (closes #7029)

src/popupwin.c

@@ -665,9 +665,9 @@ apply_general_options(win_T *wp, dict_T *dict)
 	    wp->w_firstline = -1;
     }
 
-    di = dict_find(dict, (char_u *)"scrollbar", -1);
-    if (di != NULL)
-	wp->w_want_scrollbar = dict_get_number(dict, (char_u *)"scrollbar");
+    nr = dict_get_bool(dict, (char_u *)"scrollbar", -1);
+    if (nr != -1)
+	wp->w_want_scrollbar = nr;
 
     str = dict_get_string(dict, (char_u *)"title", FALSE);
     if (str != NULL)

src/testdir/test_popupwin.vim

@@ -2168,6 +2168,21 @@ func Test_popup_scrollbar()
       endif
     endfunc
 
+    def CreatePopup(text: list<string>)
+      popup_create(text, #{
+	    \ minwidth: 30,
+	    \ maxwidth: 30,
+	    \ minheight: 4,
+	    \ maxheight: 4,
+	    \ firstline: 1,
+	    \ lastline: 4,
+	    \ wrap: true,
+	    \ scrollbar: true,
+	    \ mapping: false,
+	    \ filter: Popup_filter,
+	    \ })
+    enddef
+
     func PopupScroll()
       call popup_clear()
       let text =<< trim END
@@ -2179,18 +2194,7 @@ func Test_popup_scrollbar()
 	  long line long line long line long line long line long line
 	  long line long line long line long line long line long line
       END
-      call popup_create(text, #{
-	    \ minwidth: 30,
-	    \ maxwidth: 30,
-	    \ minheight: 4,
-	    \ maxheight: 4,
-	    \ firstline: 1,
-	    \ lastline: 4,
-	    \ wrap: v:true,
-	    \ scrollbar: v:true,
-	    \ mapping: v:false,
-	    \ filter: funcref('Popup_filter')
-	    \ })
+      call CreatePopup(text)
     endfunc
     map <silent> <F3> :call test_setmouse(5, 36)<CR>
     map <silent> <F4> :call test_setmouse(4, 42)<CR>

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1763,
 /**/
     1762,
 /**/