Fix deactivating syntax highlight

Author: arsmn

config.go

@@ -93,7 +93,7 @@ type Config struct {
 	OnComplete template.JS `json:"-"`
 
 	// An object with the activate and theme properties.
-	SyntaxHighlight *SyntaxHighlightConfig `json:"syntaxHighlight,omitempty"`
+	SyntaxHighlight *SyntaxHighlightConfig `json:"-"`
 
 	// Controls whether the "Try it out" section should be enabled by default.
 	// default: false
@@ -199,6 +199,13 @@ type SyntaxHighlightConfig struct {
 	Theme string `json:"theme,omitempty"`
 }
 
+func (shc SyntaxHighlightConfig) Value() interface{} {
+	if shc.Activate {
+		return shc
+	}
+	return false
+}
+
 type OAuthConfig struct {
 	// ID of the client sent to the OAuth2 provider.
 	// default: ""

index.go

@@ -61,6 +61,7 @@ const indexTmpl string = `
         {{- end}}
       ];
       config.filter = {{.Filter.Value}}
+      config.syntaxHighlight = {{.SyntaxHighlight.Value}}
       {{if .TagsSorter}}
         config.tagsSorter = {{.TagsSorter}}
       {{end}}