Remove overlapping wealth components from total_wealth

Keep only property_wealth, corporate_wealth, and savings.
Drop net_financial_wealth, gross_financial_wealth, and shareholding
as they overlap with savings and are not MECE.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: PolicyEngine-Bot

policyengine_uk/variables/household/wealth/total_wealth.py

@@ -12,7 +12,4 @@ class total_wealth(Variable):
         "property_wealth",
         "corporate_wealth",
         "savings",
-        "net_financial_wealth",
-        "gross_financial_wealth",
-        "shareholding",
     ]