[FIX] qweb: bind handlers to component

Before this commit, the handlers were bound to the current context,
which is often the component but not necessarily.  In some cases, a sub
scope can be created (with t-foreach, or slots, or t-call), and the
context is actually an object with the actual component instance it its
prototype chain, but not the component.

src/qweb/expression_parser.ts

@@ -81,7 +81,7 @@ const STATIC_TOKEN_MAP: { [key: string]: TKind } = {
 
 // note that the space after typeof is relevant. It makes sure that the formatted
 // expression has a space after typeof
-const OPERATORS = ".,===,==,+,!==,!=,!,||,&&,>=,>,<=,<,?,-,*,/,%,typeof ,=>,=".split(",");
+const OPERATORS = ".,===,==,+,!==,!=,!,||,&&,>=,>,<=,<,?,-,*,/,%,typeof ,=>,=,;".split(",");
 
 type Tokenizer = (expr: string) => Token | false;