fix(compiler-core): transform kebab case props to camelcase on slots (#2490)

fix #2488

packages/compiler-core/__tests__/transforms/transformSlotOutlet.spec.ts

@@ -95,7 +95,9 @@ describe('compiler: transform <slot> outlets', () => {
   })
 
   test('default slot outlet with props', () => {
-    const ast = parseWithSlots(`<slot foo="bar" :baz="qux" />`)
+    const ast = parseWithSlots(
+      `<slot foo="bar" :baz="qux" :foo-bar="foo-bar" />`
+    )
     expect((ast.children[0] as ElementNode).codegenNode).toMatchObject({
       type: NodeTypes.JS_CALL_EXPRESSION,
       callee: RENDER_SLOT,
@@ -124,6 +126,16 @@ describe('compiler: transform <slot> outlets', () => {
                 content: `qux`,
                 isStatic: false
               }
+            },
+            {
+              key: {
+                content: `fooBar`,
+                isStatic: true
+              },
+              value: {
+                content: `foo-bar`,
+                isStatic: false
+              }
             }
           ]
         }