fix plugin setting check boolean

Author: nickofthyme

src/plugins/vis_type_vislib/public/plugin.ts

@@ -61,7 +61,7 @@ export class VisTypeVislibPlugin
     core: VisTypeVislibCoreSetup,
     { expressions, visualizations, charts }: VisTypeVislibPluginSetupDependencies
   ) {
-    if (core.uiSettings.get(LEGACY_CHARTS_LIBRARY, true)) {
+    if (!core.uiSettings.get(LEGACY_CHARTS_LIBRARY, true)) {
       // Register only non-replaced vis types
       convertedTypeDefinitions.forEach(visualizations.createBaseVisualization);
       visualizations.createBaseVisualization(pieVisTypeDefinition);

src/plugins/vis_type_xy/public/plugin.ts

@@ -71,7 +71,7 @@ export class VisTypeXyPlugin
     core: VisTypeXyCoreSetup,
     { expressions, visualizations, charts }: VisTypeXyPluginSetupDependencies
   ) {
-    if (core.uiSettings.get(LEGACY_CHARTS_LIBRARY, true)) {
+    if (!core.uiSettings.get(LEGACY_CHARTS_LIBRARY, true)) {
       setUISettings(core.uiSettings);
       setThemeService(charts.theme);
       setColorsService(charts.legacyColors);