Activate generate contract metadata by default

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

@@ -105,8 +105,9 @@ module.exports = class SettingsTab extends ViewPlugin {
 
     this._view.generateContractMetadata = yo`<input onchange=${onchangeGenerateContractMetadata} id="generatecontractmetadata" data-id="settingsTabGenerateContractMetadata" type="checkbox" class="custom-control-input">`
     this._view.generateContractMetadataLabel = yo`<label class="form-check-label custom-control-label align-middle" data-id="settingsTabGenerateContractMetadataLabel" for="generatecontractmetadata">Generate contract metadata. Generate a JSON file in the contract folder. Allows to specify library addresses the contract depends on. If nothing is specified, Remix deploys libraries automatically.</label>`
+    if (this.config.get('settings/generate-contract-metadata') === undefined) this.config.set('settings/generate-contract-metadata', true)
     if (this.config.get('settings/generate-contract-metadata')) this._view.generateContractMetadata.setAttribute('checked', '')
-    elementStateChanged(self._view.generateContractMetadataLabel, !this.config.get('settings/generate-contract-metadata'))   
+    elementStateChanged(self._view.generateContractMetadataLabel, !this.config.get('settings/generate-contract-metadata'))
 
     this._view.pluginInput = yo`<textarea rows="4" cols="70" id="plugininput" type="text" class="${css.pluginTextArea}" ></textarea>`