fix: builds for templates (#1540)

* fix: builds for templates

* prettier:

Author: saihaj

.changeset/thin-buttons-swim.md

@@ -0,0 +1,5 @@
+---
+'@graphprotocol/graph-cli': patch
+---
+
+fix graph build for templates

packages/cli/src/compiler/index.ts

@@ -452,7 +452,7 @@ export default class Compiler {
       const inputFile = path.relative(baseDir, absoluteMappingPath);
       this._validateMappingContent(absoluteMappingPath);
 
-      const eventHandlers = templateName.getIn(['mapping', 'eventHandlers']);
+      const eventHandlers = template.getIn(['mapping', 'eventHandlers']);
       // TODO: improve the types
       for (const eventHandler of (eventHandlers as any).toJS()) {
         compilerDebug('Validating Template handler %s', eventHandler.handler);