ignore/types: fix futhark type extension
ignore/types: fix futhark type extension

Previously, the 'fut' type only matches files called '.fut', while in
reality we want to match all files with the '.fut' extension. This
commit fixes that issue.

PR #2027
BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep