ci: Fix typo in Dockerfile (#406)

tests/Dockerfile

@@ -53,17 +53,16 @@ ENV JAVA_HOME /home/nonroot/java
 ENV PATH $JAVA_HOME/bin:$PATH
 ENV JAVA_URL https://download.java.net/java/GA/jdk12.0.2/e482c34c86bd4bf8b56c0b35558996b9/10/GPL/openjdk-12.0.2_linux-x64_bin.tar.gz
 
-RUN mkdir -p "$JAVA_HOME"; \
+RUN mkdir -p "$JAVA_HOME"
 RUN set -eux; \
     curl -fL -o $JAVA_HOME/openjdk.tgz "$JAVA_URL"; \
     tar --extract \
         --file $JAVA_HOME/openjdk.tgz \
         --directory "$JAVA_HOME" \
         --strip-components 1 \
-		--no-same-owner \
-	; \
-RUN java -version; \
-    javac -version
+        --no-same-owner
+
+RUN java -version && javac -version
 
 # Create blank project
 RUN USER=nonroot cargo new --bin /src/starship