[FIX] code generator: prevent AST change

This commit removes an AST change during the code generation of slots.
Before, the `compileTSlot` function deleted the `t-props` attribute
directly on `ast.attrs`. This creates wrong code when compiling a
second time as the `t-props` attribute does not exist anymore.

tests/compiler/t_slot.test.ts

@@ -0,0 +1,15 @@
+import { parseXML } from "../../src/common/utils";
+import { compile } from "../../src/compiler";
+
+describe("t-slot", () => {
+  test("compile t-props correctly multiple time", () => {
+    const template = `<t t-slot="default" t-props="{ a: 1 }"/>`;
+    const parsedTemplate = parseXML(template).firstChild as Element;
+
+    const fn1 = compile(parsedTemplate);
+    expect(fn1.toString()).toMatchSnapshot();
+
+    const fn2 = compile(parsedTemplate);
+    expect(fn2.toString()).toBe(fn1.toString());
+  });
+});