fix(compiler): [attribute~=value] selector (#11696)

Change the seperator regular expression to ignore tildes which are followed by an equal sign.

Closes #9644

modules/@angular/compiler/src/shadow_css.ts

@@ -426,7 +426,7 @@ export class ShadowCss {
       return scopedP;
     };
 
-    const sep = /( |>|\+|~)\s*/g;
+    const sep = /( |>|\+|~(?!=))\s*/g;
     const scopeAfter = selector.indexOf(_polyfillHostNoCombinator);
 
     let scoped = '';