Remove initializers TSPacket and TSHeader

The initialization was added in commit 8e70b50 on Jan 10, 2020
to remove warnings from a static code analyzer.
However, the initialization is not needed at all, see comments on lines 52-53 and 61-62, added in
commit 6a4845b on May 1, 2008 and on line 207, added in
commit 4ca584a on Jun 21, 2008 by the original author of this code.
Superfluous initializations are not harmful but in this case it can cost a significant amount of processing resources.
For one full transport stream this can be 4 to 5 Mbyte/second that is needlessly initialized.

mythtv/libs/libmythtv/mpeg/tspacket.h

@@ -173,7 +173,7 @@ class MTV_PUBLIC TSHeader
     static constexpr unsigned int kHeaderSize {4};
     static const TSHeaderArray kPayloadOnlyHeader;
   private:
-    TSHeaderArray m_tsData {};
+    TSHeaderArray m_tsData;         // Intentionally no initialization
 };
 
 static_assert(sizeof(TSHeader) == 4,
@@ -261,7 +261,7 @@ class MTV_PUBLIC TSPacket : public TSHeader
     static constexpr unsigned int k8VSBEmissionSize {208};
     static const TSPacket    *kNullPacket;
   private:
-    std::array<uint8_t,184> m_tsPayload {};
+    std::array<uint8_t,184> m_tsPayload;    // Intentionally no initialization
 };
 
 static_assert(sizeof(TSPacket) == 188,