Make line numbers in the editor optional

browser/main/Detail/SnippetNoteDetail.js

@@ -530,6 +530,7 @@ class SnippetNoteDetail extends React.Component {
             fontSize={editorFontSize}
             indentType={config.editor.indentType}
             indentSize={editorIndentSize}
+            lineNumber
             keyMap={config.editor.keyMap}
             onChange={(e) => this.handleCodeChange(index)(e)}
             ref={'code-' + index}