Revert review suggestion.

No, we don't want to run: Command '['rustup', '-', '-', 'v', 'e', 'r', 'b', 'o', 's', 'e', 'install', 'nightly-2020-02-03']'

deploy.py

@@ -310,13 +310,13 @@ class OpenSKInstaller:
       # Need to update
       rustup_install = ["rustup"]
       if self.args.verbose_build:
-        rustup_install.extend("--verbose")
+        rustup_install.extend(["--verbose"])
       rustup_install.extend(["install", target_toolchain_fullstring])
       self.checked_command(rustup_install)
 
     rustup_target = ["rustup"]
     if self.args.verbose_build:
-      rustup_target.extend("--verbose")
+      rustup_target.extend(["--verbose"])
     rustup_target.extend(
         ["target", "add", SUPPORTED_BOARDS[self.args.board].arch])
     self.checked_command(rustup_target)
@@ -368,7 +368,7 @@ class OpenSKInstaller:
     if is_example:
       command.extend(["--example", self.args.application])
     if self.args.verbose_build:
-      command.extend("--verbose")
+      command.extend(["--verbose"])
     self.checked_command(command, env=env)
     app_path = os.path.join("target", props.arch, "release")
     if is_example:
@@ -406,7 +406,7 @@ class OpenSKInstaller:
         "elf2tab", package_parameter, self.args.application, "-o", tab_filename
     ]
     if self.args.verbose_build:
-      elf2tab_args.extend("--verbose")
+      elf2tab_args.extend(["--verbose"])
     for arch, app_file in binaries.items():
       dest_file = os.path.join(self.tab_folder, "{}.elf".format(arch))
       shutil.copyfile(app_file, dest_file)