Fix dimensionality check

The dimensionality check seemed to fail the Op when the input had MORE
than two dimensions. It should fail the Op when the input has LESS than
two dimensions

Author: gselzer

src/main/java/net/imagej/ops/filter/sharpen/DefaultSharpen.java

@@ -112,7 +112,7 @@ public RandomAccessibleInterval<T> calculate(
 		// output image
 		final RandomAccessibleInterval<T> output = (RandomAccessibleInterval<T>) ops().create().img(in());
 
-		if(input.numDimensions() > 2) {
+		if(input.numDimensions() < 2) {
 			throw new IllegalArgumentException("Input has too few dimensions! Only 2+ dimensional images allowed!");
 		}
 

src/main/java/net/imagej/ops/filter/smooth/DefaultSmooth.java

@@ -112,7 +112,7 @@ public RandomAccessibleInterval<T> calculate(
 		// output image
 		final RandomAccessibleInterval<T> output = (RandomAccessibleInterval<T>) ops().create().img(in());
 
-		if(input.numDimensions() > 2) {
+		if(input.numDimensions() < 2) {
 			throw new IllegalArgumentException("Input has too few dimensions! Only 2+ dimensional images allowed!");
 		}