Improve code for image conversion. This relates to issue TDE/tdebase#376.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

src/servicemenus/imageconverter.desktop

@@ -11,19 +11,19 @@ TryExec=convert
 [Desktop Action convToJPEG]
 Name=JPEG
 Icon=image-x-generic
-Exec=convert %f "`echo %f | perl -pe 's/\.[^.\/]+\n//'`.jpg"
+Exec=convert %f -set filename:base "%d/%t" '%[filename:base].jpg'
 
 [Desktop Action convToPNG]
 Name=PNG
 Icon=image-x-generic
-Exec=convert %f "`echo %f | perl -pe 's/\.[^.\/]+\n//'`.png"
+Exec=convert %f -set filename:base "%d/%t" '%[filename:base].png'
 
 [Desktop Action convToTIF]
 Name=TIF
 Icon=image-x-generic
-Exec=convert %f "`echo %f | perl -pe 's/\.[^.\/]+\n//'`.tif"
+Exec=convert %f -set filename:base "%d/%t" '%[filename:base].tif'
 
 [Desktop Action convToGIF]
 Name=GIF
 Icon=image-x-generic
-Exec=convert %f "`echo %f | perl -pe 's/\.[^.\/]+\n//'`.gif"
+Exec=convert %f -set filename:base "%d/%t" '%[filename:base].gif'