SME: controlling source unit shouldn't be ohms
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# Description
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The SPICE Model Editor gives the unit for the controlling source as ohms. This is a reference to an external source model - it should be unitless.
This is true for current-controlled voltage sources and current-controlled current sources.

# Steps to reproduce
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1. Symbol properties
2. Edit Simulation Model
3. Select Built-in SPICE Model, Device: Voltage Source, Type: Current-controlled
4. Look at "Controlling voltage source" parameter unit
5. Select Built-in SPICE Model, Device: Current Source, Type: Current-controlled
6. Look at "Controlling voltage source" parameter unit
# KiCad Version
```
Application: KiCad Symbol Editor arm64 on arm64
Version: 8.0.0, release build
Libraries:
wxWidgets 3.2.4
FreeType 2.13.2
HarfBuzz 8.2.0
FontConfig 2.14.2
Platform: macOS Monterey Version 12.7.1 (Build 21G920), 64 bit, Little endian, wxMac
wxWidgets: 3.2.4 (wchar_t,wx containers)
Boost: 1.82.0
OCC: 7.7.2
Curl: 7.87.0
ngspice: 42
Compiler: Clang 14.0.3 with C++ ABI 1002
Build settings:
```
issue