fix: don't suppress run output when --silent is passed

PR-URL: #1987
Credit: @G-Rath
Close: #1987
Reviewed-by: @ruyadorno

Author: G-Rath

lib/run-script.js

@@ -69,7 +69,7 @@ const runScript = async (args) => {
     path,
     args,
     scriptShell,
-    stdio: log.level === 'silent' ? 'pipe' : 'inherit',
+    stdio: 'inherit',
     stdioString: true,
     pkg
   }

test/lib/run-script.js

@@ -284,13 +284,13 @@ t.test('run silent', async t => {
     t.match(RUN_SCRIPTS, [
       {
         event: 'preenv',
-        stdio: 'pipe'
+        stdio: 'inherit'
       },
       {
         path: npm.localPrefix,
         args: [],
         scriptShell: undefined,
-        stdio: 'pipe',
+        stdio: 'inherit',
         stdioString: true,
         pkg: { name: 'x', version: '1.2.3', _id: 'x@1.2.3', scripts: {
           env: 'env'
@@ -299,7 +299,7 @@ t.test('run silent', async t => {
       },
       {
         event: 'postenv',
-        stdio: 'pipe'
+        stdio: 'inherit'
       }
     ])
   })