remove muirglacier & ensure 1559 tx are used

apps/remix-ide/src/app/tabs/runTab/settings.js

@@ -102,10 +102,6 @@ class SettingsUI {
               title="Execution environment does not connect to any node, everything is local and in memory only."
               value="vm-berlin" name="executionContext" fork="berlin" > JavaScript VM (Berlin)
             </option>
-            <option id="vm-mode-muirglacier" data-id="settingsVMMuirGlacierMode"
-              title="Execution environment does not connect to any node, everything is local and in memory only."
-              value="vm-istanbul" name="executionContext" fork="muirglacier"> JavaScript VM (Muirglacier)
-            </option>
             <option id="vm-mode-london" data-id="settingsVMLondonMode"
               title="Execution environment does not connect to any node, everything is local and in memory only."
               value="vm-london" name="executionContext" fork="london"> JavaScript VM (London)

libs/remix-lib/src/execution/txRunnerVM.ts

@@ -72,8 +72,9 @@ export class TxRunnerVM {
         }
       }
 
+      let EIP1559 = this.commonContext.hardfork() !== 'berlin'
       let tx
-      if (this.commonContext.hardfork === 'berlin' || this.commonContext.hardfork === 'muirglacier') {
+      if (!EIP1559) {
         tx = Transaction.fromTxData({
           nonce: new BN(res.nonce),
           gasPrice: '0x1',
@@ -103,7 +104,8 @@ export class TxRunnerVM {
           number: self.blockNumber,
           coinbase: coinbases[self.blockNumber % coinbases.length],
           difficulty: difficulties[self.blockNumber % difficulties.length],
-          gasLimit: new BN(gasLimit.replace('0x', ''), 16).imuln(2)
+          gasLimit: new BN(gasLimit.replace('0x', ''), 16).imuln(2),
+          baseFeePerGas: EIP1559 ? '0x1' : undefined
         },
         transactions: [tx]
       }, { common: this.commonContext })