fix(nvim): set cterm colors

using the colors described here rather than the color map
https://neovim.io/doc/user/syntax.html#ctermbg

Author: gigamaax

nvim/api_test.go

@@ -3570,8 +3570,8 @@ func testHighlight(v *Nvim) func(*testing.T) {
 			const testHLName = `Test`
 			testHLAttrs := &HLAttrs{
 				Bold:            true,
-				CtermForeground: cm[`Red`],
-				CtermBackground: cm[`Yellow`],
+				CtermForeground: 12,
+				CtermBackground: 14,
 			}
 			if err := v.SetHighlight(nsID, testHLName, testHLAttrs); err != nil {
 				t.Fatal(err)
@@ -3647,8 +3647,8 @@ func testHighlight(v *Nvim) func(*testing.T) {
 			const testHLName = `Test`
 			testHLAttrs := &HLAttrs{
 				Bold:            true,
-				CtermForeground: cm[`Red`],
-				CtermBackground: cm[`Yellow`],
+				CtermForeground: 12,
+				CtermBackground: 14,
 			}
 			b.SetHighlight(nsID, testHLName, testHLAttrs)
 			if err := b.Execute(); err != nil {

nvim/types.go

@@ -152,7 +152,7 @@ type HLAttrs struct {
 
 	// Cterm is cterm attribute map. Sets attributed for cterm colors.
 	//
-	// Note thet by default cterm attributes are same as attributes of gui color.
+	// Note that by default cterm attributes are same as attributes of gui color.
 	//
 	// This value is used only SetHighlight.
 	Cterm *HLAttrs `msgpack:"cterm,omitempty"`