Fix file-types declaration for racket

Both the racket and scheme entries used the rkt file-extension. This
commit removes that entry for scheme and so that the racket entry takes
precedence. We explicitly point to the scheme grammar now and setup
queries that inherit from scheme. This should enable using the racket
language server configuration.

languages.toml

@@ -880,6 +880,7 @@ file-types = ["rkt"]
 shebangs = ["racket"]
 comment-token = ";"
 language-server = { command = "racket", args = ["-l", "racket-langserver"] }
+grammar = "scheme"
 
 [[language]]
 name = "comment"
@@ -1526,7 +1527,7 @@ source = { git = "https://github.com/metio/tree-sitter-ssh-client-config", rev =
 name = "scheme"
 scope = "source.scheme"
 injection-regex = "scheme"
-file-types = ["ss", "rkt"] # "scm",
+file-types = ["ss"] # "scm",
 roots = []
 comment-token = ";"
 indent = { tab-width = 2, unit = "  " }

runtime/queries/racket/highlights.scm

@@ -0,0 +1 @@
+; inherits: scheme

runtime/queries/racket/injections.scm

@@ -0,0 +1 @@
+; inherits: scheme