fix: update contract name and treasury name

Using mia over stx makes it easier to understand what the treasury is associated with, and the treasury name is part of the suggestion here (and fits in the 10char limit): #67 (comment)

Clarinet.toml

@@ -94,7 +94,7 @@ path = "contracts/extensions/ccd002-treasury-v3.clar"
 clarity_version = 2
 epoch = 2.5
 
-[contracts.ccd002-treasury-stx-rewards-v3]
+[contracts.ccd002-treasury-mia-rewards-v3]
 path = "contracts/extensions/ccd002-treasury-v3.clar"
 clarity_version = 2
 epoch = 2.5

contracts/proposals/ccip019-pox-4-stacking.clar

@@ -73,7 +73,7 @@
     (try! (contract-call? .base-dao set-extensions
       (list
         {extension: .ccd002-treasury-mia-mining-v3, enabled: true}
-        {extension: .ccd002-treasury-stx-rewards-v3, enabled: true}
+        {extension: .ccd002-treasury-mia-rewards-v3, enabled: true}
       )
     ))
 
@@ -87,11 +87,11 @@
     ;; delegate stack the STX in the mining and rewards treasuries (up to 50M STX each)
     ;; MAINNET: SP21YTSM60CAY6D011EZVEVNKXVW8FVZE198XEFFP.pox4-fast-pool-v3
     (try! (contract-call? .ccd002-treasury-mia-mining-v3 delegate-stx u50000000000000 'SP21YTSM60CAY6D011EZVEVNKXVW8FVZE198XEFFP.pox4-fast-pool-v3))
-    (try! (contract-call? .ccd002-treasury-stx-rewards-v3 delegate-stx u50000000000000 'SP21YTSM60CAY6D011EZVEVNKXVW8FVZE198XEFFP.pox4-fast-pool-v3))
+    (try! (contract-call? .ccd002-treasury-mia-rewards-v3 delegate-stx u50000000000000 'SP21YTSM60CAY6D011EZVEVNKXVW8FVZE198XEFFP.pox4-fast-pool-v3))
 
     ;; add treasuries to ccd005-city-data
     (try! (contract-call? .ccd005-city-data add-treasury miaId .ccd002-treasury-mia-mining-v3 "mining-v3"))
-    (try! (contract-call? .ccd005-city-data add-treasury miaId .ccd002-treasury-stx-rewards-v3 "stx-v3"))
+    (try! (contract-call? .ccd005-city-data add-treasury miaId .ccd002-treasury-mia-rewards-v3 "rewards-v3"))
 
     (ok true)
   )