fix: fix theme color (#3089)

frontend/appflowy_flutter/packages/flowy_infra/lib/colorscheme/default_colorscheme.dart

@@ -101,9 +101,9 @@ class DefaultColorScheme extends FlowyColorScheme {
           tint8: const Color(0xff00F0E2),
           tint9: const Color(0xff00BCF0),
           main1: _darkMain1,
-          main2: _darkMain1,
+          main2: const Color(0xff00B7EA),
           shadow: const Color(0xff0F131C),
-          sidebarBg: const Color(0xff2D223B),
+          sidebarBg: const Color(0xff232B38),
           divider: _darkShader3,
           topbarBg: _darkShader1,
           icon: _darkShader5,

frontend/appflowy_flutter/packages/flowy_infra/lib/colorscheme/lavender.dart

@@ -104,9 +104,9 @@ class LavenderColorScheme extends FlowyColorScheme {
           tint8: const Color(0xff00F0E2),
           tint9: const Color(0xff00BCF0),
           main1: _darkMain1,
-          main2: const Color(0xff9327FF),
+          main2: _darkMain1,
           shadow: _black,
-          sidebarBg: const Color(0xff232B38),
+          sidebarBg: const Color(0xff2D223B),
           divider: _darkShader3,
           topbarBg: _darkShader1,
           icon: _darkShader5,