Minor fixes, performance improvements

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Hello, I didn't do much this past week due to holidays and family meetings and such. Here is what I did do though:

Fixed quick product search opening when it shouldn't

There was an issue where the quick product search would open whenever you typed a P into the search. This was most annoying on mobile if you had auto-capitalization on.
This is now fixed, so the quick search shortcut will not work if you are typing something.

LTTStore watcher performance improvements

I have made some minor performance improvements to the homepage of the LTTStore Watcher so it should hopefully load slightly faster now.
This is a combination of changing how the frontend loads the parts and some backend optimization.

I also added some faster caching to the exchange rate API, which was sometimes slowing down all requests for the lttstore watcher

I hope to add more performance improvements in the future.