Fix inconsistent line number foreground color in GUI mode

In term mode the number uses nord4, but in GUI mode nord3 was used
instead. This was not intended and has been changed to match the term
mode style.

GH-100

README.md

@@ -24,6 +24,7 @@ Nord Vim is a 16 colorspace theme build to run in GUI- and terminal mode with su
     - [Uniform Status Lines](#uniform-status-lines)
     - [Comment Contrast](#comment-contrast)
     - [Uniform diff Background](#uniform-diff-background)
+    - [Line number background](#line-number-background)
   - [Plugin Support](#plugin-support)
     - [UI Plugins](#ui-plugins)
     - [Language Plugins](#language-plugins)
@@ -230,14 +231,17 @@ let g:nord_uniform_diff_background = 1
 <p align="center"><strong>Colorful backgrounds (default)</strong><br><img src="https://raw.githubusercontent.com/arcticicestudio/nord-vim/develop/assets/scrot-config-uniform-diff-default.png"/><br><strong>Uniform diff background</strong><br><img src="https://raw.githubusercontent.com/arcticicestudio/nord-vim/develop/assets/scrot-config-uniform-diff.png"/>
 </p>
 
-### Highlighting the current line number
+### Line number background
 
-Enables background for line number of the current line the same with text background of the current line.
+Enables background for the line number of the current line.
 
 ```vim
-let g:nord_cursor_line_number_coloring = 1
+let g:nord_cursor_line_number_background = 1
 ```
 
+<p align="center"><strong>No background (default)</strong><br><img src="https://raw.githubusercontent.com/arcticicestudio/nord-vim/develop/assets/scrot-config-cursor-line-number-background-default.png"/><br><strong>Enabled background</strong><br><img src="https://raw.githubusercontent.com/arcticicestudio/nord-vim/develop/assets/scrot-config-cursor-line-number-background.png"/>
+</p>
+
 ## Plugin Support
 
 Nord Vim provides support for many third-party language- and UI plugins.

colors/nord.vim

@@ -185,7 +185,7 @@ endif
 "+--- Gutter ---+
 call s:hi("CursorColumn", "", s:nord1_gui, "NONE", s:nord1_term, "", "")
 if g:nord_cursor_line_number_background == 0
-  call s:hi("CursorLineNr", s:nord3_gui, s:nord0_gui, "NONE", "", "", "")
+  call s:hi("CursorLineNr", s:nord4_gui, s:nord0_gui, "NONE", "", "", "")
 else
   call s:hi("CursorLineNr", s:nord4_gui, s:nord1_gui, "NONE", s:nord1_term, "", "")
 endif