scripted-diff: Rename pindexBestHeader, fHavePruned

...to m_best_header and m_have_pruned

-BEGIN VERIFY SCRIPT-
find_regex="\bpindexBestHeader\b" \
    && git grep -l -E "$find_regex" -- src \
        | xargs sed -i -E "s@$find_regex@m_best_header@g"
find_regex="\bfHavePruned\b" \
    && git grep -l -E "$find_regex" -- src \
        | xargs sed -i -E "s@$find_regex@m_have_pruned@g"
-END VERIFY SCRIPT-

src/node/chainstate.cpp

@@ -49,7 +49,7 @@ std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
 
     if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
 
-    // LoadBlockIndex will load fHavePruned if we've ever removed a
+    // LoadBlockIndex will load m_have_pruned if we've ever removed a
     // block file from disk.
     // Note that it also sets fReindex based on the disk flag!
     // From here on out fReindex and fReset mean something different!
@@ -65,7 +65,7 @@ std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
 
     // Check for changed -prune state.  What we are concerned about is a user who has pruned blocks
     // in the past, but is now trying to run unpruned.
-    if (chainman.m_blockman.fHavePruned && !fPruneMode) {
+    if (chainman.m_blockman.m_have_pruned && !fPruneMode) {
         return ChainstateLoadingError::ERROR_PRUNED_NEEDS_REINDEX;
     }