DecimalNumber() updater font size dependent on placement when using unit="°"

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## Description of bug / unexpected behavior
The font size of a `DecimalNumber()` object changes when updated when it is placed using `.next_to()` to an object which itself was placed relative to the top-left corner using `to_edge(UL)`.

## Expected behavior
The font size of the `DecimalNumber()` should not change when its value is updated.

## How to reproduce the issue

Code for reproducing the problem

```py

class decupdate2(Scene):
def construct(self):
x = ValueTracker(2)

theta = MathTex(r"\theta =").to_corner(UL)

theta2val = DecimalNumber(
0, num_decimal_places=1, group_with_commas=False, unit="°", edge_to_fix=LEFT
).next_to(theta, RIGHT)

def theta2Updater(mobj):
mobj.set_value(np.arctan2(3,x.get_value())*180/PI)

theta2val.add_updater(theta2Updater)

self.add(theta,theta2val)
self.wait()
self.play(x.animate.set_value(6),run_time=3)
self.wait()
```
Similar code - only difference is the placement of the object next to the DecimalNumber()

```py
class decupdate3(Scene):
def construct(self):
x = ValueTracker(2)

theta = MathTex(r"\theta =").to_edge(LEFT)

theta2val = DecimalNumber(
0, num_decimal_places=1, group_with_commas=False, unit="°", edge_to_fix=LEFT
).next_to(theta, RIGHT)

def theta2Updater(mobj):
mobj.set_value(np.arctan2(3,x.get_value())*180/PI)

theta2val.add_updater(theta2Updater)

self.add(theta,theta2val)
self.wait()
self.play(x.animate.set_value(6),run_time=3)
self.wait()
```

## Additional media files
Images/GIFs
With the wrong scaling:


Second code without wrong scaling


## System specifications

System Details

- OS: Windows 10 and Manimator on Discord
- RAM: enough
- Python version: 3.9.8 and Manimator on Discord

Start by running the two supplied Scene examples and comparing DecimalNumber() behavior when positioned with next_to() after to_corner(UL) versus to_edge(LEFT). Trace the DecimalNumber() set_value updater path alongside placement and edge_to_fix=LEFT. Done means updating the value no longer changes its font size in the reproduced placement.

Written by the indexing model from the issue text.