Fix duplicate RGB colours in palette (#18299)

* Remove duplicate RGB colours from palette

* Update hash

* Update reference dat file

---------

Co-authored-by: Spacek531 <spacek531@comcast.net>
Co-authored-by: duncanspumpkin <duncans_pumpkin@hotmail.co.uk>

src/openrct2/drawing/ImageImporter.h

@@ -361,18 +361,18 @@ constexpr const GamePalette StandardPalette = { {
     { 0, 255, 255, 255 },
 
     // 230 - 234 (Water waves)
-    { 99, 107, 7, 255 },
-    { 99, 107, 7, 255 },
     { 135, 143, 39, 255 },
     { 123, 131, 27, 255 },
-    { 99, 107, 7, 255 },
+    { 95, 103, 7, 255 },
+    { 87, 95, 0, 255 },
+    { 111, 119, 15, 255 },
 
     // 235 - 249 (Water sparkles)
-    { 151, 155, 55, 255 },
-    { 151, 155, 55, 255 },
+    { 255, 255, 199, 255 },
     { 227, 227, 155, 255 },
-    { 203, 203, 115, 255 },
-    { 151, 155, 55, 255 },
+    { 175, 175, 83, 255 },
+    { 151, 155, 51, 255 },
+    { 203, 203, 123, 255 },
 
     // 240 - 242 (Extra grey)
     { 91, 91, 67, 255 },

test/tests/ImageImporterTests.cpp

@@ -54,5 +54,5 @@ TEST_F(ImageImporterTests, Import_Logo)
     // Update expected hash if change is expected.
     ASSERT_NE(nullptr, result.Buffer.data());
     auto hash = GetHash(result.Buffer.data(), result.Buffer.size());
-    ASSERT_EQ(0xCEF27C7D, hash);
+    ASSERT_EQ(uint32_t(0x212A99BC), hash);
 }