Fix Solana address detection

[vermi321]

At the moment the TS build doesn't pass.

src/pages/content/components/twitter/tweetHandlers.tsx:116:33 - error TS2488: Type 'true' must have a '[Symbol.iterator]()' method that returns an iterator.

116     for (const solanaAddress of hasSolAddress) {
                                    ~~~~~~~~~~~~~

src/pages/content/components/twitter/tweetHandlers.tsx:126:23 - error TS2339: Property 'length' does not exist on type 'true'.

126     if (hasSolAddress.length == numberOfFalsePositiveSolanaAddresses) {
                          ~~~~~~

The reason for that is the checkForSolAddress function returns boolean while in the code it is expected to return string[] | null. Also the extra check in the checkForSolAddress for A-Z, a-z and 0-9 matches don't do anything extra which isn't already covered by the Solana address regex a few lines above, which makes it simply overcomplicated and it can be inlined just like EVM address matcher.

[vermi321]

Filtering out address without characters in any of these 3 categories isn't right, because it would result in false negatives - it is possible to have Solana address without numbers or lower/upper cased letter.