Revert "Patch Dockerfile to replace reference to non-existent context"

This reverts commit a4212e99b0.

No longer needed because we reverted the Docker submodule.

assets/patches/Dockerfile-bash.sublime-syntax.patch

@@ -1,11 +0,0 @@
---- syntaxes/02_Extra/Docker/Syntaxes/Dockerfile-bash.sublime-syntax
-+++ syntaxes/02_Extra/Docker/Syntaxes/Dockerfile-bash.sublime-syntax
-@@ -50,7 +50,7 @@
-         1: keyword.control.dockerfile
-       push:
-         - match: (?=\s*\[)
--          set: scope:source.json#arrays
-+          set: scope:source.json#array
-           with_prototype:
-             - match: \n
-               pop: true