Import: Make sure to not convert text height from draw units to points

When importing DXF files using the C++ importer, TEXT and MTEXT entities
had incorrect heights. For example:
- text with height 100mm in the DXF file was imported as 35.28mm in FC.
The scaling factor was consistent to be 0.3528.

The issue was that we were applying a point-to-millimeter conversion to
the text height , but that seems to be incorrect since according to DXF
spec, TEXT and MTEXT entity heights are always specified in drawing
units, not in points, so just remove that code.

src/Mod/Import/App/dxf/dxf.cpp

@@ -2172,8 +2172,7 @@ bool CDxfRead::ReadText()
     ResolveEntityAttributes();
 
     if ((this->*stringToUTF8)(textPrefix)) {
-        OnReadText(insertionPoint, height * 25.4 / 72.0, textPrefix, rotation);
-        // NOLINTEND(cppcoreguidelines-avoid-magic-numbers, readability-magic-numbers)
+        OnReadText(insertionPoint, height, textPrefix, rotation);
     }
     else {
         ImportError("Unable to process encoding for TEXT/MTEXT '%s'\n", textPrefix);