fix: .json.json extension when bootstrapping new snippet file

reported via https://www.reddit.com/r/neovim/comments/1rqo1bh/

Author: chrisgrieser

lua/scissors/vscode-format/validate-bootstrap.lua

@@ -83,7 +83,7 @@ end
 ---@return Scissors.SnippetFile -- the newly created snippet file
 function M.bootstrapSnippetFile(filetype)
 	local snipDir = require("scissors.config").config.snippetDir
-	local newSnipName = filetype .. ".json"
+	local newSnipName = filetype
 
 	-- create empty snippet file
 	local newSnipFilepath