keyboard: Switch default maps for surrounding pairs to the delimiters themselves

[pokey]

in this map:

cursorless/packages/cursorless-vscode/src/keyboard/keyboard-config.fixture.json

Lines 85 to 100 in 5f94e08

	"cursorless.experimental.keyboard.modal.keybindings.pairedDelimiter": {
	"wl": "angleBrackets",
	"wt": "backtickQuotes",
	"wb": "curlyBrackets",
	"wd": "doubleQuotes",
	"wwd": "escapedDoubleQuotes",
	"wwp": "escapedParentheses",
	"wws": "escapedSquareBrackets",
	"wwq": "escapedSingleQuotes",
	"wp": "parentheses",
	"wq": "singleQuotes",
	"ws": "squareBrackets",
	"wg": "string",
	"wj": "any",
	"wk": "collectionBoundary"
	}

we would eg change wb to {