Overbar not applied across subscript
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# Description
<!-- What is the current behavior and what is the expected behavior? -->
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The text entry `~{E_{x}ample}`
In 6.0 it looks like this (overbar across the whole word):

Whereas in 7.0 rc1 looks like this (overbar not applied in the subscript):

# Steps to reproduce
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1. Copy/paste the below s-expression in eeschema
```
(text "~{E_{x}ample}" (at 91.44 114.3 0)
(effects (font (size 1.27 1.27)) (justify left bottom))
(uuid 5786d268-50e8-47c6-b44a-932dcba29e7e)
)
```
# KiCad Version
<!-- Copy version information (from main menu Help->About KiCad ->Copy Version Info) and paste it between the triple backticks below to preserve the formatting. -->
```
Application: KiCad Schematic Editor x64 on x64
Version: (7.0.0-rc1-51-ge7e151c46c), debug build
Libraries:
wxWidgets 3.2.1
FreeType 2.12.1
HarfBuzz 5.0.1
FontConfig 2.14.1
libcurl/7.86.0-DEV Schannel zlib/1.2.13
Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
Date: Jan 9 2023 00:26:22
wxWidgets: 3.2.1 (wchar_t,wx containers)
Boost: 1.80.0
OCC: 7.6.2
Curl: 7.86.0-DEV
ngspice: 37
Compiler: Visual C++ 1933 without C++ ABI
Build settings:
KICAD_SPICE=ON
KICAD_STDLIB_DEBUG=OFF
KICAD_STDLIB_LIGHT_DEBUG=OFF
KICAD_SANITIZE_ADDRESS=OFF
KICAD_SANITIZE_THREADS=OFF
```
issue