<ui5-shellbar> search box overlaps other icons when the window is resized

[codefactor]

Describe the bug
The search box in the shellbar is not properly positioned on the screen when the window is resized

To reproduce
Steps to reproduce the behavior:

1. Go to https://sap.github.io/ui5-webcomponents/master/playground/components/ShellBar/
2. Click the search button
3. Resize the window horizontally
4. Notice how the search box does not move position horizontally

Expected behavior
The search box should reposition itself according to the dimensions of the screen.

Screenshots

Context

• UI5 Web Components version
• OS/Platform: {...}
• Browser (if relevant): {...}
• Other information: {...}

Affected components (if known)

Log output / Any errors in the console

{...}

[ilhan007]

We have that issue from our latest exloratory testing: #2000

But it is ok we can keep yours.

[jdichev]

Hello, this issue will be looked into with in one of the team's next sprints.
Internal reference: 4905