Fix SSM checkInstallation always returning true (#2689)

Author: abrooksv

jetbrains-core/src/software/aws/toolkits/jetbrains/services/ecs/resources/SessionManagerPluginInstallationVerification.kt

@@ -7,7 +7,6 @@ import com.intellij.execution.configurations.GeneralCommandLine
 import com.intellij.execution.process.CapturingProcessHandler
 import com.intellij.openapi.application.runInEdt
 import com.intellij.openapi.project.Project
-import com.intellij.vcs.log.runInEdt
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 import software.aws.toolkits.jetbrains.services.ecs.exec.SessionManagerPluginWarning
@@ -16,10 +15,7 @@ object SessionManagerPluginInstallationVerification {
     private fun checkInstallation(): Boolean = runBlocking(Dispatchers.IO) {
         try {
             val process = CapturingProcessHandler(GeneralCommandLine("session-manager-plugin")).runProcess()
-            if (process.exitCode != 0) {
-                false
-            }
-            true
+            process.exitCode == 0
         } catch (e: Exception) {
             false
         }