getToken+comparison ==> startsWith, reuse available information

Change-Id: Ie7eef48ee20da9bc01d0b046435bb270f8d1e18f
Reviewed-on: https://gerrit.libreoffice.org/67654
Tested-by: Jenkins
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

sc/source/ui/unoobj/docuno.cxx

@@ -833,20 +833,13 @@ OString ScModelObj::getTextSelection(const char* pMimeType, OString& rUsedMimeTy
 
     // Take care of UTF-8 text here.
     OString aMimeType(pMimeType);
-    bool bConvert = false;
-    sal_Int32 nIndex = 0;
-    if (aMimeType.getToken(0, ';', nIndex) == "text/plain")
-    {
-        if (aMimeType.getToken(0, ';', nIndex) == "charset=utf-8")
-        {
-            aMimeType = "text/plain;charset=utf-16";
-            bConvert = true;
-        }
-    }
+    bool bConvert{ aMimeType.startsWith("text/plain;charset=utf-8") };
+    if (bConvert)
+        aMimeType = "text/plain;charset=utf-16";
 
     datatransfer::DataFlavor aFlavor;
     aFlavor.MimeType = OUString::fromUtf8(aMimeType.getStr());
-    if (aMimeType == "text/plain;charset=utf-16")
+    if (bConvert || aMimeType == "text/plain;charset=utf-16")
         aFlavor.DataType = cppu::UnoType<OUString>::get();
     else
         aFlavor.DataType = cppu::UnoType< uno::Sequence<sal_Int8> >::get();