`gui.hide_keyboard` does not work on iOS html5 safari

**Describe the bug (REQUIRED)**
`gui.hide_keyboard` does not hide the virtual keyboard on iOS html5 safari

**To Reproduce (REQUIRED)**
Steps to reproduce the behavior:
1. make a script
2. make the script open the virtual keyboard using `gui.show_keyboard` (showing the keyboard works perfectly well)
3. run `gui.hide_keyboard` some time after running `gui.show_keyboard`
4. success

**Expected behavior (REQUIRED)**
`gui.hide_keyboard` hiding the keyboard

**Defold version (REQUIRED):**
- Version 1.6.4

**Platforms (REQUIRED):**
- Platforms: HTML5 (safari)
- OS: iOS 15.8.1
- Device: iPhone 7