vim-patch:8.2.1727: a popup created with "cursorline" will ignore "firstline"

Problem:    A popup created with "cursorline" will ignore "firstline".
Solution:   When both "cursorline" and "firstline" are present put the cursor
            on "firstline". (closes vim/vim#7000)  Add the "winid" argument to
            getcurpos().
99ca9c4868

Skip popup window related code.
Cherry-pick all of Test_getcurpos_setpos() from patch 8.2.0610.

src/nvim/eval.lua

@@ -151,7 +151,7 @@ return {
     getcmdtype={},
     getcmdwintype={},
     getcompletion={args={2, 3}, base=1},
-    getcurpos={},
+    getcurpos={args={0, 1}, base=1},
     getcwd={args={0, 2}, base=1},
     getenv={args=1, base=1},
     getfontname={args={0, 1}},