Fix typo "shadown" (microsoft#182916)

Author: Greg Van Liew

src/vs/platform/theme/common/colorRegistry.ts

@@ -450,7 +450,7 @@ export const listWarningForeground = registerColor('list.warningForeground', { d
 export const listFilterWidgetBackground = registerColor('listFilterWidget.background', { light: darken(editorWidgetBackground, 0), dark: lighten(editorWidgetBackground, 0), hcDark: editorWidgetBackground, hcLight: editorWidgetBackground }, nls.localize('listFilterWidgetBackground', 'Background color of the type filter widget in lists and trees.'));
 export const listFilterWidgetOutline = registerColor('listFilterWidget.outline', { dark: Color.transparent, light: Color.transparent, hcDark: '#f38518', hcLight: '#007ACC' }, nls.localize('listFilterWidgetOutline', 'Outline color of the type filter widget in lists and trees.'));
 export const listFilterWidgetNoMatchesOutline = registerColor('listFilterWidget.noMatchesOutline', { dark: '#BE1100', light: '#BE1100', hcDark: contrastBorder, hcLight: contrastBorder }, nls.localize('listFilterWidgetNoMatchesOutline', 'Outline color of the type filter widget in lists and trees, when there are no matches.'));
-export const listFilterWidgetShadow = registerColor('listFilterWidget.shadow', { dark: widgetShadow, light: widgetShadow, hcDark: widgetShadow, hcLight: widgetShadow }, nls.localize('listFilterWidgetShadow', 'Shadown color of the type filter widget in lists and trees.'));
+export const listFilterWidgetShadow = registerColor('listFilterWidget.shadow', { dark: widgetShadow, light: widgetShadow, hcDark: widgetShadow, hcLight: widgetShadow }, nls.localize('listFilterWidgetShadow', 'Shadow color of the type filter widget in lists and trees.'));
 export const listFilterMatchHighlight = registerColor('list.filterMatchBackground', { dark: editorFindMatchHighlight, light: editorFindMatchHighlight, hcDark: null, hcLight: null }, nls.localize('listFilterMatchHighlight', 'Background color of the filtered match.'));
 export const listFilterMatchHighlightBorder = registerColor('list.filterMatchBorder', { dark: editorFindMatchHighlightBorder, light: editorFindMatchHighlightBorder, hcDark: contrastBorder, hcLight: activeContrastBorder }, nls.localize('listFilterMatchHighlightBorder', 'Border color of the filtered match.'));
 export const treeIndentGuidesStroke = registerColor('tree.indentGuidesStroke', { dark: '#585858', light: '#a9a9a9', hcDark: '#a9a9a9', hcLight: '#a5a5a5' }, nls.localize('treeIndentGuidesStroke', "Tree stroke color for the indentation guides."));