[refactor] Use consistent booleans in default config

[szpasztor]

The default global config sometimes uses the "true"/"false" string and sometimes a real JSON boolean type to represent booleans. It should always do the latter.

Autogenerated config:

{
	"theme": "theme-light",
	"daemon_start_advanced": false,
	"must_open_form": true,
	"locale": "en",
	"network": "mainnet",
	"set_language": "true",
	"ui_animations": true,
	"show_tutorial": "true",
	"show_privacy": true,
	"show_spvchoice": true,
	"allowed_external_requests": [],
	"proxy_type": null,
	"proxy_location": null,
	"remote_credentials": {
		"rpc_user": "",
		"rpc_password": "",
		"rpc_cert": "",
		"rpc_host": "",
		"rpc_port": ""
	},
	"appdata_path": "",
	"spv_mode": false,
	"spv_connect": [],
	"max_wallet_count": 3,
	"timezone": "local",
	"disable_hardware_accel": false
}