Switch to vim-tidal master branch now required features have landed

Previously we pointed to a branch of a fork that provided the necessary
features to allow for using tidal and supercollider boot files from the
nix store. These features have since landed in the following PRs:

- tidalcycles/vim-tidal#74
- tidalcycles/vim-tidal#77

Master also includes a new feature for automatically running sclang in a
second terminal instance:

- tidalcycles/vim-tidal#78

Author: mitchmindtree

flake.lock

@@ -23,11 +23,7 @@
       flake = false;
     };
     vim-tidal-src = {
-      # TODO: Switch back to `tidalcycles` repo once Vim8 terminal support
-      # lands and following boot tidal and superdirt terminal commits.
-      # See this PR: https://github.com/tidalcycles/vim-tidal/pull/74
-      # url = "github:tidalcycles/vim-tidal/master";
-      url = "github:mitchmindtree/vim-tidal/mitchmindtree";
+      url = "github:tidalcycles/vim-tidal/master";
       flake = false;
     };
     vowel-src = {