activities-save-all adjusts height minibuffer when framed mode

Using `activities` in framed mode the `activities-save-all` function will adjust the `minibuffer` of current activity usually shrinking it.

This happens when `minibuffer` is currently being used with a larger feature, such as `consult-line`.

Steps to reproduce
====
1. 2 framed activities open.
2. Launch `consult-line` in current frame.
3. Wait until activities idle timer which calls `activities-save-all`.
4. a. During `activities-save-all` the frame switches to other frame,
b. `consult-line` `minibuffer` adjusts for the other frame which changes across frames,
c. save happens,
d. switches back to original frame with smaller `minibuffer`.

If continue to leave up `consult-line`, the `minibuffer` may continue to shrink with each `activities-save-all` call.

Here's a screen recording of issue: