remove unnecessary code

Author: Kalmaegi

build/lib/stylelint/vscode-known-variables.json

@@ -316,7 +316,6 @@
 		"--vscode-inlineChatInput-border",
 		"--vscode-inlineChatInput-focusBorder",
 		"--vscode-inlineChatInput-placeholderForeground",
-		"--vscode-inlineChatDiff-removed",
 		"--vscode-input-background",
 		"--vscode-input-border",
 		"--vscode-input-foreground",