Fix arrow token after a nested module captured weird stuff elsewhere

Author: chenglou

ReScript.sublime-syntax

@@ -269,7 +269,7 @@ contexts:
           captures:
             1: punctuation.section.braces.begin
           push: moduleInner
-        - match: '='
+        - match: '=[^\S]'
           scope: keyword.operator.assignment
           set: moduleRHS
         - match: '(?=\S)'

syntax_test.res

@@ -424,5 +424,5 @@ let getAudience = (~excited) => excited ? "world!" : "world"
 
 @bs.module external foo: {..} => {..} = "bla"
 //                        ^^ keyword.operator
-//                            ^^ keyword.operator
+//                            ^^ storage.type.function keyword.declaration.function
 //                                ^^ keyword.operator