feat(tsconfig): remove sourceMap (smithy-lang#443)

Author: trivikr

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.json

@@ -5,7 +5,6 @@
     "target": "ES2018",
     "module": "commonjs",
     "strict": true,
-    "sourceMap": true,
     "downlevelIteration": true,
     "importHelpers": true,
     "noEmitHelpers": true,