fixup: drop "running execution contexts" variant

spec.html

@@ -11845,7 +11845,7 @@ <h1>
 
   <emu-clause id="sec-execution-contexts">
     <h1>Execution Contexts</h1>
-    <p>An <dfn variants="execution contexts">execution context</dfn> brings together information that is relevant for the runtime evaluation of some unit of code (e.g., a script, a module, or a function object). At any point in time, there is at most one execution context per agent whose associated code is being evaluated. This is known as the agent's <dfn id="running-execution-context" variants="running execution contexts">running execution context</dfn>. All references to the running execution context in this specification denote the running execution context of the surrounding agent.</p>
+    <p>An <dfn variants="execution contexts">execution context</dfn> brings together information that is relevant for the runtime evaluation of some unit of code (e.g., a script, a module, or a function object). At any point in time, there is at most one execution context per agent whose associated code is being evaluated. This is known as the agent's <dfn id="running-execution-context">running execution context</dfn>. All references to the running execution context in this specification denote the running execution context of the surrounding agent.</p>
     <p>Each execution context has at least the state components listed in <emu-xref href="#table-state-components-for-all-execution-contexts"></emu-xref>.</p>
     <emu-table id="table-state-components-for-all-execution-contexts" caption="State Components for All Execution Contexts" oldids="table-22">
       <table>