feat(runtimes): reduce existential deposit to 2 units

runtime/g1/src/parameters.rs

@@ -72,7 +72,7 @@ parameter_types! {
 
 // Balances
 frame_support::parameter_types! {
-    pub const ExistentialDeposit: Balance = 500;
+    pub const ExistentialDeposit: Balance = 200;
     pub const MaxLocks: u32 = 50;
 }
 

runtime/gdev/src/parameters.rs

@@ -70,7 +70,7 @@ parameter_types! {
 
 // Balances
 frame_support::parameter_types! {
-    pub const ExistentialDeposit: Balance = 500;
+    pub const ExistentialDeposit: Balance = 200;
     pub const MaxLocks: u32 = 50;
 }
 

runtime/gtest/src/parameters.rs

@@ -72,7 +72,7 @@ parameter_types! {
 
 // Balances
 frame_support::parameter_types! {
-    pub const ExistentialDeposit: Balance = 500;
+    pub const ExistentialDeposit: Balance = 200;
     pub const MaxLocks: u32 = 50;
 }