eeschema: standard hotkey force H/V-mode

Description

proposal just for consistency: set the hotkey for H/V-restricted mode in eeschema to same hotkey as in board-editor (Shift+Space)

reasoning:

• board and schematic-editor both have a H/V-restricted mode
• both have a hotkey which toggles between H/V restricted on/off
• but only in the board-editor this hotkey is set to a standard hotkey-combination (Shift+space)
• in eeschema the hot key for H/V-restricted mode is not set
• as (Shift+space) is unused in eeschema I can't see a reason against setting Shift+Space as H/V-hotkey also in eeschema
• this action helps new users (enhance getting-started-experience), I think senior users already have there own setting

this affects v6.0.x and v6.99

Steps to reproduce

1. get a fresh installation of kicad, without imported old settings
2. open any project , open board+schematic
3. open preferences->hotkey
4. look at board-editor->H/V-mode: set to Shift+Space
5. look at eeschema-editor->H/V-mode: set to nothing

KiCad Version

Application: KiCad (64-bit)

Version: (6.99.0-942-g3129f96686), release build

Libraries:
	wxWidgets 3.1.5
	FreeType 2.11.1

Platform: Windows 10 (build 19042), 64-bit edition, 64 bit, Little endian, wxMSW

	wxWidgets: 3.1.5 (wchar_t,wx containers)
	Boost: 1.76.0
	OCC: 7.6.0
	Curl: 7.78.0-DEV
	ngspice: 36
	Compiler: Visual C++ 1928 without C++ ABI

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON