Refactor test to be more lenient in timing

vector/src/androidTest/java/im/vector/app/core/utils/TemporaryStoreTest.kt

@@ -24,14 +24,14 @@ class TemporaryStoreTest {
 
     @Test
     fun testTemporaryStore() {
-        // Keep the data 30 millis
-        val store = TemporaryStore<String>(30)
+        // Keep the data 300 millis
+        val store = TemporaryStore<String>(300)
 
         store.data = "test"
         store.data shouldBe "test"
-        sleep(15)
+        sleep(10)
         store.data shouldBe "test"
-        sleep(20)
+        sleep(300)
         store.data shouldBe null
     }
 }