fix typo (#39)

#### 📖 Summary

- fix typo in message for extension install.

#### 📑 Test Plan

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##### Details / Justification

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#### 📚 Additional Notes

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #39

arkanum

@@ -147,7 +147,7 @@ function instCodeExtension() {
   rm -f /tmp/eamodio.gitlens-13.1.1.vsix
 
   # OneDarkPro
-  say "Downloading 'One Dark Pro' theme..." "V"
+  say "Downloading 'One Dark Pro' theme..." "Extension"
   curl -fsSL https://open-vsx.org/api/zhuangtongfa/material-theme/3.15.6/file/zhuangtongfa.material-theme-3.15.6.vsix -o /tmp/zhuangtongfa.material-theme-3.15.6.vsix
   say "Installing 'One Dark Pro' theme..." "Extension"
   install-extension /tmp/zhuangtongfa.material-theme-3.15.6.vsix