Use a different saner syntax for pcall

takes less lines, looks much better

remove neoscroll.lua, missed in 2952f4d5c7

lua/theme.lua

@@ -1,15 +1,10 @@
 vim.g.nvchad_theme = "onedark"
 
-local base16
-if
-    not pcall(
-        function()
-            base16 = require "base16"
-        end
-    )
- then
-    return false
-else
+local present, base16 = pcall(require, "base16")
+
+if present then
     base16(base16.themes["onedark"], true)
     return true
+else
+    return false
 end