Polygon changed their native currency to POL

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All occurences of "MATIC" should be changed to "POL".

See https://polygon.technology/blog/matic-to-pol-migration-is-now-live-everything-you-need-to-know

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From https://polygon.technology/blog/save-the-date-matic-pol-migration-coming-september-4th-everything-you-need-to-know :

Wallet Providers
Update symbol: Wallet providers may consider changing the symbol of the native gas token from MATIC to POL on the Polygon PoS chain.
Confirm embedded dApp readiness: Confirm that wallet-embedded dApps (bridges, staking providers, etc.) are prepared for the September 4th upgrade of the native bridge.

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MATIC still needs to be changed to POL in the app. e.g. at:

alpha-wallet-android/app/src/main/java/com/alphawallet/app/C.java

Line 87 in 82c165b

public static final String POLYGON_SYMBOL = "MATIC";