Update OneDark theme to use light-gray for inlay hints. (#6503)

Co-authored-by: Jack Allison <jacallis@cisco.com>

runtime/themes/onedark.toml

@@ -54,6 +54,7 @@
 "ui.virtual.indent-guide" = { fg = "faint-gray" }
 "ui.virtual.whitespace" = { fg = "light-gray" }
 "ui.virtual.ruler" = { bg = "gray" }
+"ui.virtual.inlay-hint" = { fg = "light-gray" }
 
 "ui.cursor" = { fg = "white", modifiers = ["reversed"] }
 "ui.cursor.primary" = { fg = "white", modifiers = ["reversed"] }