Change Campbell's default foreground color (#1629)

Changed the foreground color from #F2F2F2 to #CCCCCC so that ESC[1m _actually_ brightens it.

(cherry picked from commit f63cada)

src/cascadia/TerminalApp/CascadiaSettings.cpp

@@ -37,7 +37,7 @@ CascadiaSettings::~CascadiaSettings()
 ColorScheme _CreateCampbellScheme()
 {
     ColorScheme campbellScheme{ L"Campbell",
-                                RGB(242, 242, 242),
+                                RGB(204, 204, 204),
                                 RGB(12, 12, 12) };
     auto& campbellTable = campbellScheme.GetTable();
     auto campbellSpan = gsl::span<COLORREF>(&campbellTable[0], gsl::narrow<ptrdiff_t>(COLOR_TABLE_SIZE));