gdev: use real money growth rate

runtime/gdev/src/parameters.rs

@@ -81,7 +81,8 @@ frame_support::parameter_types! {
 
 // Universal dividend
 parameter_types! {
-    pub const SquareMoneyGrowthRate: Permill = Permill::one();
+    // 0.002_381_440 = 0.0488^2
+    pub const SquareMoneyGrowthRate: Permill = Permill::from_parts(2_381_440);
 }
 
 // Multisig

runtime/gtest/src/parameters.rs

@@ -88,7 +88,7 @@ parameter_types! {
     pub const UdCreationPeriod: BlockNumber = DAYS;
     pub const UdFirstReeval: BlockNumber = 2 * DAYS;
     pub const UdReevalPeriod: Balance = 7;
-    pub const UdReevalPeriodInBlocks: BlockNumber = 100800; // 86400 *7 / 6
+    pub const UdReevalPeriodInBlocks: BlockNumber = 100800; // 86400 * 7 / 6
 }
 
 /*******/