Update uses of # to . in our scheme files where they are interchangeable.

uses of `#` cause ERRORs in our scheme highlighting

crates/zed/src/languages/cpp/highlights.scm

@@ -31,13 +31,13 @@
   declarator: (field_identifier) @function)
 
 ((namespace_identifier) @type
- (#match? @type "^[A-Z]"))
+    (.match? @type "^[A-Z]"))
 
 (auto) @type
 (type_identifier) @type
 
 ((identifier) @constant
- (#match? @constant "^_*[A-Z][A-Z\\d_]*$"))
+    (.match? @constant "^_*[A-Z][A-Z\\d_]*$"))
 
 (field_identifier) @property
 (statement_identifier) @label

crates/zed/src/languages/cpp/injections.scm

@@ -1,7 +1,7 @@
 (preproc_def
     value: (preproc_arg) @content
-    (#set! "language" "c++"))
+    (.set! "language" "c++"))
 
 (preproc_function_def
     value: (preproc_arg) @content
-    (#set! "language" "c++"))
+    (.set! "language" "c++"))