fix: prioritize hide over highlight_border

## Details

Previously if the following options were set:

- `code.border = 'hide'`
- `code.highlight_border = false`

We would skip concealing the border line and leave it as is. The only
`border` values that need to be gated based on `highlight_border` being
`false` are `thick` and `thin`, since a highlight is needed to create
the virtual text.

To fix this swap the order values are checked.

Author: MeanderingProgrammer

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '8.7.2'
+M.version = '8.7.3'
 
 function M.check()
     M.start('versions')

lua/render-markdown/render/markdown/code.lua

@@ -176,10 +176,10 @@ end
 function Render:border(node, thin)
     local kind = self.config.border
     local highlight = self.config.highlight_border
-    if kind == 'none' or not node or not highlight then
-        -- do nothing
-    elseif kind == 'hide' then
+    if kind == 'hide' then
         self.marks:over(true, node, { conceal_lines = '' })
+    elseif kind == 'none' or not node or not highlight then
+        -- do nothing
     else
         local icon = kind == 'thin' and thin or ' '
         if icon ~= ' ' then