Address code review feedback: fix indentation and complete RAII migration

[Copilot]

Addresses feedback on PR #1098 regarding indentation inconsistencies and completion of RAII-based mutex management for mStreamMutex.

Changes

• Fixed indentation in EnableContentRestrictions(): Corrected else block at lines 12164-12168 where mApplyContentRestriction = true; was improperly indented
• Fixed indentation in SetPreferredLanguages(): Corrected nested else block indentation around line 12776
• Removed deprecated mutex APIs: Deleted AcquireStreamLock(), TryStreamLock(), and ReleaseStreamLock() from priv_aamp.cpp, priv_aamp.h, and test infrastructure
• Fixed memory management: Changed free() to cJSON_free() for cJSON-allocated strings in GetThumbnailTracks()

Example

Before (incorrect indentation):

else
{
    AAMPLOG_INFO("mpStreamAbstractionAAMP is not Ready, %d", state);
mApplyContentRestriction = true;  // Wrong indent level
}

After (correct indentation):

else
{
    AAMPLOG_INFO("mpStreamAbstractionAAMP is not Ready, %d", state);
    mApplyContentRestriction = true;  // Properly indented with tabs
}

All mutex operations now use RAII patterns (std::lock_guard, std::unique_lock) exclusively.

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