feat(no-default): removes default normal strategy

[Alexangelj]

Changelog

• Removes DEFAULT_STRATEGY state variable in Portfolio contract.
• Removes using the default strategy if a zero address is passed as a strategy in createPool.
• Updates the test setup to deploy a normal strategy contract and use it when configuring the portfolio deployment + pools for unit tests.
• Removes using the non-default/default variables in the Position renderer
• Pool id encoded the default/non-default strategy info, so we need to decide on how to replace that info with something useful or remove it. For now, it's defaulting to "false", which is a leading 0x0 bit.